--- a/dom/bindings/Bindings.conf
+++ b/dom/bindings/Bindings.conf
@@ -43,20 +43,16 @@
 #
 # The following fields are either a string, an array (defaults to an empty
 # array) or a dictionary with three possible keys (all, getterOnly and
 # setterOnly) each having such an array as the value
 #
 #   * implicitJSContext - attributes and methods specified in the .webidl file
 #                         that require a JSContext as the first argument
 #
-# A descriptor can also have 'skipGen': True specified if it should be skipped
-# when deciding what header includes to generate and should never have an
-# implementation generated for it.  This is now unused and is about to go away.
-#
 # The value for an interface is a dictionary which specifies the
 # descriptor to use when generating that interface's binding.
 
 DOMInterfaces = {
 
 'AbstractWorker': {
     'concrete': False
 },

--- a/dom/bindings/Codegen.py
+++ b/dom/bindings/Codegen.py
@@ -5310,17 +5310,17 @@ def getJSToNativeConversionInfo(type, de
                     promiseRv.MaybeSetPendingException(cx);
                     $*{exceptionCode}
                   }
                 #endif // SPIDERMONKEY_PROMISE
                 }
                 """,
                 getPromiseGlobal=getPromiseGlobal,
                 exceptionCode=exceptionCode)
-        elif not descriptor.skipGen and not descriptor.interface.isConsequential() and not descriptor.interface.isExternal():
+        elif not descriptor.interface.isConsequential() and not descriptor.interface.isExternal():
             if failureCode is not None:
                 templateBody += str(CastableObjectUnwrapper(
                     descriptor,
                     "&${val}.toObject()",
                     "${declName}",
                     failureCode))
             else:
                 templateBody += str(FailureFatalCastableObjectUnwrapper(
@@ -6418,17 +6418,17 @@ def getWrapTemplateForType(type, descrip
         descriptor = descriptorProvider.getDescriptor(type.unroll().inner.identifier.name)
         if type.nullable():
             wrappingCode = ("if (!%s) {\n" % (result) +
                             indent(setNull()) +
                             "}\n")
         else:
             wrappingCode = ""
 
-        if not descriptor.interface.isExternal() and not descriptor.skipGen:
+        if not descriptor.interface.isExternal():
             if descriptor.wrapperCache:
                 wrapMethod = "GetOrCreateDOMReflector"
                 wrapArgs = "cx, %s, ${jsvalHandle}" % result
             else:
                 # Hack: the "Promise" interface is OK to return from
                 # non-newobject things even when it's not wrappercached; that
                 # happens when using SpiderMonkey promises, and the WrapObject()
                 # method will just return the existing reflector, which is just
@@ -12948,18 +12948,17 @@ class CGRegisterWorkerBindings(CGAbstrac
         CGAbstractMethod.__init__(self, None, 'RegisterWorkerBindings', 'bool',
                                   [Argument('JSContext*', 'aCx'),
                                    Argument('JS::Handle<JSObject*>', 'aObj')])
         self.config = config
 
     def definition_body(self):
         descriptors = self.config.getDescriptors(hasInterfaceObject=True,
                                                  isExposedInAnyWorker=True,
-                                                 register=True,
-                                                 skipGen=False)
+                                                 register=True)
         conditions = []
         for desc in descriptors:
             bindingNS = toBindingNamespace(desc.name)
             condition = "!%s::GetConstructorObject(aCx, aObj)" % bindingNS
             if desc.isExposedConditionally():
                 condition = (
                     "%s::ConstructorEnabled(aCx, aObj) && " % bindingNS
                     + condition)
@@ -12974,18 +12973,17 @@ class CGRegisterWorkerDebuggerBindings(C
         CGAbstractMethod.__init__(self, None, 'RegisterWorkerDebuggerBindings', 'bool',
                                   [Argument('JSContext*', 'aCx'),
                                    Argument('JS::Handle<JSObject*>', 'aObj')])
         self.config = config
 
     def definition_body(self):
         descriptors = self.config.getDescriptors(hasInterfaceObject=True,
                                                  isExposedInWorkerDebugger=True,
-                                                 register=True,
-                                                 skipGen=False)
+                                                 register=True)
         conditions = []
         for desc in descriptors:
             bindingNS = toBindingNamespace(desc.name)
             condition = "!%s::GetConstructorObject(aCx, aObj)" % bindingNS
             if desc.isExposedConditionally():
                 condition = (
                     "%s::ConstructorEnabled(aCx, aObj) && " % bindingNS
                     + condition)
@@ -13002,18 +13000,17 @@ class CGResolveSystemBinding(CGAbstractM
                                    Argument('JS::Handle<JSObject*>', 'aObj'),
                                    Argument('JS::Handle<jsid>', 'aId'),
                                    Argument('bool*', 'aResolvedp')])
         self.config = config
 
     def definition_body(self):
         descriptors = self.config.getDescriptors(hasInterfaceObject=True,
                                                  isExposedInSystemGlobals=True,
-                                                 register=True,
-                                                 skipGen=False)
+                                                 register=True)
 
         def descNameToId(name):
             return "s%s_id" % name
         jsidNames = [descNameToId(desc.name) for desc in descriptors]
         jsidDecls = CGList(CGGeneric("static jsid %s;\n" % name)
                            for name in jsidNames)
 
         jsidInits = CGList(
@@ -13302,18 +13299,17 @@ class CGBindingRoot(CGThing):
         bindingDeclareHeaders = dict.fromkeys((
             'mozilla/dom/BindingDeclarations.h',
             'mozilla/dom/Nullable.h',
             'mozilla/ErrorResult.h',
             ),
             True)
 
         descriptors = config.getDescriptors(webIDLFile=webIDLFile,
-                                            hasInterfaceOrInterfacePrototypeObject=True,
-                                            skipGen=False)
+                                            hasInterfaceOrInterfacePrototypeObject=True)
 
         unionTypes = UnionsForFile(config, webIDLFile)
 
         (unionHeaders, unionImplheaders, unionDeclarations, traverseMethods,
          unlinkMethods, unionStructs) = UnionTypes(unionTypes, config)
 
         bindingDeclareHeaders.update(dict.fromkeys(unionHeaders, True))
         bindingHeaders.update(dict.fromkeys(unionImplheaders, True))
@@ -16282,18 +16278,17 @@ class GlobalGenRoots():
         curr = CGNamespace.build(['mozilla', 'dom'],
                                  CGWrapper(curr, post='\n'))
         curr = CGWrapper(curr, post='\n')
 
         # Add the includes
         defineIncludes = [CGHeaders.getDeclarationFilename(desc.interface)
                           for desc in config.getDescriptors(hasInterfaceObject=True,
                                                             register=True,
-                                                            isExposedInAnyWorker=True,
-                                                            skipGen=False)]
+                                                            isExposedInAnyWorker=True)]
 
         curr = CGHeaders([], [], [], [], [], defineIncludes,
                          'RegisterWorkerBindings', curr)
 
         # Add include guards.
         curr = CGIncludeGuard('RegisterWorkerBindings', curr)
 
         # Done.
@@ -16308,18 +16303,17 @@ class GlobalGenRoots():
         curr = CGNamespace.build(['mozilla', 'dom'],
                                  CGWrapper(curr, post='\n'))
         curr = CGWrapper(curr, post='\n')
 
         # Add the includes
         defineIncludes = [CGHeaders.getDeclarationFilename(desc.interface)
                           for desc in config.getDescriptors(hasInterfaceObject=True,
                                                             register=True,
-                                                            isExposedInWorkerDebugger=True,
-                                                            skipGen=False)]
+                                                            isExposedInWorkerDebugger=True)]
 
         curr = CGHeaders([], [], [], [], [], defineIncludes,
                          'RegisterWorkerDebuggerBindings', curr)
 
         # Add include guards.
         curr = CGIncludeGuard('RegisterWorkerDebuggerBindings', curr)
 
         # Done.
@@ -16334,18 +16328,17 @@ class GlobalGenRoots():
         curr = CGNamespace.build(['mozilla', 'dom'],
                                  CGWrapper(curr, post='\n'))
         curr = CGWrapper(curr, post='\n')
 
         # Add the includes
         defineIncludes = [CGHeaders.getDeclarationFilename(desc.interface)
                           for desc in config.getDescriptors(hasInterfaceObject=True,
                                                             register=True,
-                                                            isExposedInSystemGlobals=True,
-                                                            skipGen=False)]
+                                                            isExposedInSystemGlobals=True)]
         defineIncludes.append("nsThreadUtils.h")  # For NS_IsMainThread
         defineIncludes.append("js/Id.h")  # For jsid
         defineIncludes.append("mozilla/dom/BindingUtils.h")  # AtomizeAndPinJSString
 
         curr = CGHeaders([], [], [], [], [], defineIncludes,
                          'ResolveSystemBinding', curr)
 
         # Add include guards.

--- a/dom/bindings/Configuration.py
+++ b/dom/bindings/Configuration.py
@@ -330,18 +330,16 @@ class Descriptor(DescriptorProvider):
                 headerDefault = headerDefault.replace("::", "/") + ".h"
         self.headerFile = desc.get('headerFile', headerDefault)
         self.headerIsDefault = self.headerFile == headerDefault
         if self.jsImplParent == self.nativeType:
             self.jsImplParentHeader = self.headerFile
         else:
             self.jsImplParentHeader = self.jsImplParent.replace("::", "/") + ".h"
 
-        self.skipGen = desc.get('skipGen', False)
-
         self.notflattened = desc.get('notflattened', False)
         self.register = desc.get('register', True)
 
         self.hasXPConnectImpls = desc.get('hasXPConnectImpls', False)
 
         # If we're concrete, we need to crawl our ancestor interfaces and mark
         # them as having a concrete descendant.
         self.concrete = (not self.interface.isExternal() and