--- a/content/base/public/File.h
+++ b/content/base/public/File.h
@@ -50,16 +50,17 @@ NS_DEFINE_STATIC_IID_ACCESSOR(PIFileImpl
 namespace mozilla {
 namespace dom {
 
 namespace indexedDB {
 class FileInfo;
 };
 
 struct BlobPropertyBag;
+struct ChromeFilePropertyBag;
 struct FilePropertyBag;
 class FileImpl;
 
 class File MOZ_FINAL : public nsIDOMFile
                      , public nsIXHRSendable
                      , public nsIMutable
                      , public nsSupportsWeakReference
                      , public nsWrapperCache
@@ -171,31 +172,31 @@ public:
               const nsAString& aName,
               const FilePropertyBag& aBag,
               ErrorResult& aRv);
 
   // File constructor - ChromeOnly
   static already_AddRefed<File>
   Constructor(const GlobalObject& aGlobal,
               File& aData,
-              const FilePropertyBag& aBag,
+              const ChromeFilePropertyBag& aBag,
               ErrorResult& aRv);
 
   // File constructor - ChromeOnly
   static already_AddRefed<File>
   Constructor(const GlobalObject& aGlobal,
               const nsAString& aData,
-              const FilePropertyBag& aBag,
+              const ChromeFilePropertyBag& aBag,
               ErrorResult& aRv);
 
   // File constructor - ChromeOnly
   static already_AddRefed<File>
   Constructor(const GlobalObject& aGlobal,
               nsIFile* aData,
-              const FilePropertyBag& aBag,
+              const ChromeFilePropertyBag& aBag,
               ErrorResult& aRv);
 
   virtual JSObject* WrapObject(JSContext* aCx) MOZ_OVERRIDE;
 
   uint64_t GetSize(ErrorResult& aRv);
 
   // XPCOM GetType is OK
 

--- a/content/base/src/File.cpp
+++ b/content/base/src/File.cpp
@@ -627,17 +627,17 @@ File::Constructor(
 
   nsRefPtr<File> file = new File(aGlobal.GetAsSupports(), impl);
   return file.forget();
 }
 
 /* static */ already_AddRefed<File>
 File::Constructor(const GlobalObject& aGlobal,
                   File& aData,
-                  const FilePropertyBag& aBag,
+                  const ChromeFilePropertyBag& aBag,
                   ErrorResult& aRv)
 {
   if (!nsContentUtils::IsCallerChrome()) {
     aRv.Throw(NS_ERROR_FAILURE);
     return nullptr;
   }
 
   nsRefPtr<MultipartFileImpl> impl = new MultipartFileImpl(EmptyString());
@@ -649,17 +649,17 @@ File::Constructor(const GlobalObject& aG
 
   nsRefPtr<File> domFile = new File(aGlobal.GetAsSupports(), impl);
   return domFile.forget();
 }
 
 /* static */ already_AddRefed<File>
 File::Constructor(const GlobalObject& aGlobal,
                   nsIFile* aData,
-                  const FilePropertyBag& aBag,
+                  const ChromeFilePropertyBag& aBag,
                   ErrorResult& aRv)
 {
   if (!nsContentUtils::IsCallerChrome()) {
     aRv.Throw(NS_ERROR_FAILURE);
     return nullptr;
   }
 
   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());
@@ -673,17 +673,17 @@ File::Constructor(const GlobalObject& aG
 
   nsRefPtr<File> domFile = new File(aGlobal.GetAsSupports(), impl);
   return domFile.forget();
 }
 
 /* static */ already_AddRefed<File>
 File::Constructor(const GlobalObject& aGlobal,
                   const nsAString& aData,
-                  const FilePropertyBag& aBag,
+                  const ChromeFilePropertyBag& aBag,
                   ErrorResult& aRv)
 {
   if (!nsContentUtils::IsCallerChrome()) {
     aRv.Throw(NS_ERROR_FAILURE);
     return nullptr;
   }
 
   nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aGlobal.GetAsSupports());

--- a/content/base/src/MultipartFileImpl.cpp
+++ b/content/base/src/MultipartFileImpl.cpp
@@ -231,17 +231,17 @@ MultipartFileImpl::GetMozFullPathInterna
     return;
   }
 
   blobImpl->GetMozFullPathInternal(aFilename, aRv);
 }
 
 void
 MultipartFileImpl::InitializeChromeFile(File& aBlob,
-                                        const FilePropertyBag& aBag,
+                                        const ChromeFilePropertyBag& aBag,
                                         ErrorResult& aRv)
 {
   NS_ASSERTION(!mImmutable, "Something went wrong ...");
 
   if (mImmutable) {
     aRv.Throw(NS_ERROR_UNEXPECTED);
     return;
   }
@@ -263,17 +263,17 @@ MultipartFileImpl::InitializeChromeFile(
   mBlobImpls = blobSet.GetBlobImpls();
 
   SetLengthAndModifiedDate();
 }
 
 void
 MultipartFileImpl::InitializeChromeFile(nsPIDOMWindow* aWindow,
                                         nsIFile* aFile,
-                                        const FilePropertyBag& aBag,
+                                        const ChromeFilePropertyBag& aBag,
                                         bool aIsFromNsIFile,
                                         ErrorResult& aRv)
 {
   NS_ASSERTION(!mImmutable, "Something went wrong ...");
   if (mImmutable) {
     aRv.Throw(NS_ERROR_UNEXPECTED);
     return;
   }
@@ -335,17 +335,17 @@ MultipartFileImpl::InitializeChromeFile(
   mBlobImpls = blobSet.GetBlobImpls();
 
   SetLengthAndModifiedDate();
 }
 
 void
 MultipartFileImpl::InitializeChromeFile(nsPIDOMWindow* aWindow,
                                         const nsAString& aData,
-                                        const FilePropertyBag& aBag,
+                                        const ChromeFilePropertyBag& aBag,
                                         ErrorResult& aRv)
 {
   nsCOMPtr<nsIFile> file;
   aRv = NS_NewLocalFile(aData, false, getter_AddRefs(file));
   if (NS_WARN_IF(aRv.Failed())) {
     return;
   }
 

--- a/content/base/src/MultipartFileImpl.h
+++ b/content/base/src/MultipartFileImpl.h
@@ -62,27 +62,27 @@ public:
   void InitializeBlob(
        JSContext* aCx,
        const Sequence<OwningArrayBufferOrArrayBufferViewOrBlobOrString>& aData,
        const nsAString& aContentType,
        bool aNativeEOL,
        ErrorResult& aRv);
 
   void InitializeChromeFile(File& aData,
-                            const FilePropertyBag& aBag,
+                            const ChromeFilePropertyBag& aBag,
                             ErrorResult& aRv);
 
   void InitializeChromeFile(nsPIDOMWindow* aWindow,
                             const nsAString& aData,
-                            const FilePropertyBag& aBag,
+                            const ChromeFilePropertyBag& aBag,
                             ErrorResult& aRv);
 
   void InitializeChromeFile(nsPIDOMWindow* aWindow,
                             nsIFile* aData,
-                            const FilePropertyBag& aBag,
+                            const ChromeFilePropertyBag& aBag,
                             bool aIsFromNsIFile,
                             ErrorResult& aRv);
 
   virtual already_AddRefed<FileImpl>
   CreateSlice(uint64_t aStart, uint64_t aLength,
               const nsAString& aContentType,
               ErrorResult& aRv) MOZ_OVERRIDE;
 

--- a/dom/webidl/File.webidl
+++ b/dom/webidl/File.webidl
@@ -5,39 +5,44 @@
  */
 
 interface nsIFile;
 
 [Constructor(sequence<(ArrayBuffer or ArrayBufferView or Blob or DOMString)> fileBits,
              ScalarValueString fileName, optional FilePropertyBag options),
 
  // These constructors are just for chrome callers:
- Constructor(Blob fileBits, optional FilePropertyBag options),
- Constructor(nsIFile fileBits, optional FilePropertyBag options),
- Constructor(ScalarValueString fileBits, optional FilePropertyBag options),
+ Constructor(Blob fileBits, optional ChromeFilePropertyBag options),
+ Constructor(nsIFile fileBits, optional ChromeFilePropertyBag options),
+ Constructor(ScalarValueString fileBits, optional ChromeFilePropertyBag options),
 
  Exposed=(Window,Worker)]
 interface File : Blob {
 
   readonly attribute DOMString name;
 
   [GetterThrows]
   readonly attribute long long lastModified;
 
 };
 
 
 dictionary FilePropertyBag {
 
       DOMString type = "";
-      DOMString name = ""; // TODO: to remove!
       long long lastModified;
 
 };
 
+dictionary ChromeFilePropertyBag : FilePropertyBag {
+
+      DOMString name = "";
+
+};
+
 // Mozilla extensions
 partial interface File {
 
   [GetterThrows]
   readonly attribute Date lastModifiedDate;
 
   [GetterThrows]
   readonly attribute DOMString mozFullPath;