--- a/b2g/installer/Makefile.in
+++ b/b2g/installer/Makefile.in
@@ -28,17 +28,16 @@ MOZ_LOCALIZED_PKG_LIST = $(AB_CD) multil
 DEFINES += \
 	-DAB_CD=$(AB_CD) \
 	-DMOZ_APP_NAME=$(MOZ_APP_NAME) \
 	-DPREF_DIR=$(PREF_DIR) \
 	$(NULL)
 
 DEFINES += -DJAREXT=
 
-include $(topsrcdir)/ipc/app/defs.mk
 DEFINES += -DMOZ_CHILD_PROCESS_NAME=$(MOZ_CHILD_PROCESS_NAME)
 
 # Set MSVC dlls version to package, if any.
 ifdef WIN32_REDIST_DIR
 DEFINES += -DMOZ_MSVC_REDIST=$(_MSC_VER)
 endif
 
 ifdef ENABLE_MARIONETTE

--- a/browser/installer/Makefile.in
+++ b/browser/installer/Makefile.in
@@ -64,17 +64,16 @@ endif
 
 DEFINES += -DJAREXT=
 
 ifdef MOZ_ANGLE_RENDERER
 DEFINES += -DMOZ_ANGLE_RENDERER=$(MOZ_ANGLE_RENDERER)
 DEFINES += -DMOZ_D3DCOMPILER_DLL=$(MOZ_D3DCOMPILER_DLL)
 endif
 
-include $(topsrcdir)/ipc/app/defs.mk
 DEFINES += -DMOZ_CHILD_PROCESS_NAME=$(MOZ_CHILD_PROCESS_NAME)
 
 # Set MSVC dlls version to package, if any.
 ifdef WIN32_REDIST_DIR
 DEFINES += -DMOZ_MSVC_REDIST=$(_MSC_VER)
 endif
 
 ifneq (,$(filter beta,$(MOZ_UPDATE_CHANNEL)))

--- a/configure.in
+++ b/configure.in
@@ -8654,16 +8654,33 @@ MOZ_MACBUNDLE_ID=`echo $MOZ_APP_DISPLAYN
 MOZ_MACBUNDLE_ID=${MOZ_DISTRIBUTION_ID}.${MOZ_MACBUNDLE_ID}
 if test "$MOZ_DEBUG"; then
   MOZ_MACBUNDLE_ID=${MOZ_MACBUNDLE_ID}debug
 fi
 
 AC_DEFINE_UNQUOTED(MOZ_MACBUNDLE_ID,$MOZ_MACBUNDLE_ID)
 AC_SUBST(MOZ_MACBUNDLE_ID)
 
+dnl ========================================================
+dnl = Child Process Name for IPC
+dnl ========================================================
+if test "$MOZ_WIDGET_TOOLKIT" != "android"; then
+  MOZ_CHILD_PROCESS_NAME="plugin-container${BIN_SUFFIX}"
+else
+  # We want to let Android unpack the file at install time, but it only does
+  # so if the file is named libsomething.so. The lib/ path is also required
+  # because the unpacked file will be under the lib/ subdirectory and will
+  # need to be executed from that path.
+  MOZ_CHILD_PROCESS_NAME="lib/libplugin-container.so"
+fi
+MOZ_CHILD_PROCESS_BUNDLE="plugin-container.app/Contents/MacOS/"
+
+AC_SUBST(MOZ_CHILD_PROCESS_NAME)
+AC_SUBST(MOZ_CHILD_PROCESS_BUNDLE)
+
 # The following variables are available to branding and application
 # configuration ($BRANDING/configure.sh and $APPLICATION/confvars.sh):
 # - MOZ_APP_VENDOR: Used for application.ini's "Vendor" field, which also
 # impacts profile location and user-visible fields.
 # - MOZ_APP_BASENAME: Typically stays consistent for multiple branded
 # versions of a given application (e.g. Aurora and Firefox both use
 # "Firefox"), but may vary for full rebrandings (e.g. Iceweasel). Used
 # for application.ini's "Name" field, which controls profile location in

--- a/ipc/app/Makefile.in
+++ b/ipc/app/Makefile.in
@@ -4,17 +4,16 @@
 
 DEPTH     = @DEPTH@
 topsrcdir = @top_srcdir@
 srcdir    = @srcdir@
 VPATH     = @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
 
-include $(topsrcdir)/ipc/app/defs.mk
 PROGRAM = $(MOZ_CHILD_PROCESS_NAME)
 
 ifneq ($(dir $(PROGRAM)),./)
   GENERATED_DIRS = $(dir $(PROGRAM))
 endif
 
 CPPSRCS = \
   MozillaRuntimeMain.cpp \

deleted file mode 100644
--- a/ipc/app/defs.mk
+++ /dev/null
@@ -1,14 +0,0 @@
-# This Source Code Form is subject to the terms of the Mozilla Public
-# License, v. 2.0. If a copy of the MPL was not distributed with this
-# file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-ifneq (android,$(MOZ_WIDGET_TOOLKIT))
-MOZ_CHILD_PROCESS_NAME := plugin-container$(BIN_SUFFIX)
-else
-# We want to let Android unpack the file at install time, but it only does
-# so if the file is named libsomething.so. The lib/ path is also required
-# because the unpacked file will be under the lib/ subdirectory and will
-# need to be executed from that path.
-MOZ_CHILD_PROCESS_NAME := lib/libplugin-container.so
-endif
-MOZ_CHILD_PROCESS_BUNDLE := plugin-container.app/Contents/MacOS/

--- a/ipc/glue/Makefile.in
+++ b/ipc/glue/Makefile.in
@@ -56,20 +56,15 @@ CPPSRCS += SharedMemoryBasic_android.cpp
 endif #}
 
 ifeq ($(OS_ARCH),Linux)
 CPPSRCS += ProcessUtils_linux.cpp
 else
 CPPSRCS += ProcessUtils_none.cpp
 endif
 
-include $(topsrcdir)/ipc/app/defs.mk
 DEFINES += -DMOZ_CHILD_PROCESS_NAME=\"$(MOZ_CHILD_PROCESS_NAME)\"
 DEFINES += -DMOZ_CHILD_PROCESS_BUNDLE=\"$(MOZ_CHILD_PROCESS_BUNDLE)\"
 
 include $(topsrcdir)/config/config.mk
 include $(topsrcdir)/ipc/chromium/chromium-config.mk
 
 include $(topsrcdir)/config/rules.mk
-
-# Since we get the value of MOZ_CHILD_PROCESS_NAME from another file make sure
-# to rebuild if that file changes.
-$(CPPSRCS:%.cpp=%.$(OBJ_SUFFIX)): $(topsrcdir)/ipc/app/defs.mk

--- a/mobile/android/base/Makefile.in
+++ b/mobile/android/base/Makefile.in
@@ -3,17 +3,16 @@
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
 DEPTH		= @DEPTH@
 topsrcdir	= @top_srcdir@
 srcdir		= @srcdir@
 VPATH		= @srcdir@
 
 include $(DEPTH)/config/autoconf.mk
-include $(topsrcdir)/ipc/app/defs.mk
 
 DIST_FILES = package-name.txt
 
 include $(topsrcdir)/mobile/android/base/android-services-files.mk
 
 MOZGLUE_JAVA_FILES := \
   mozglue/ByteBufferInputStream.java \
   mozglue/DirectBufferAllocator.java \

--- a/mobile/android/installer/Makefile.in
+++ b/mobile/android/installer/Makefile.in
@@ -32,18 +32,16 @@ MOZ_LOCALIZED_PKG_LIST = $(AB_CD) multil
 
 DEFINES += \
 	-DAB_CD=$(AB_CD) \
 	-DMOZ_APP_NAME=$(MOZ_APP_NAME) \
 	-DPREF_DIR=$(PREF_DIR) \
 	$(NULL)
 
 DEFINES += -DJAREXT=
-
-include $(topsrcdir)/ipc/app/defs.mk
 DEFINES += -DMOZ_CHILD_PROCESS_NAME=$(MOZ_CHILD_PROCESS_NAME)
 
 ifdef MOZ_PKG_MANIFEST_P
 MOZ_PKG_MANIFEST = package-manifest
 endif
 
 MOZ_PACKAGER_MINIFY=1
 

--- a/toolkit/mozapps/installer/packager.mk
+++ b/toolkit/mozapps/installer/packager.mk
@@ -302,18 +302,16 @@ DIST_FILES += \
   $(NULL)
 
 NON_DIST_FILES = \
   classes.dex \
   $(NULL)
 
 UPLOAD_EXTRA_FILES += gecko-unsigned-unaligned.apk
 
-include $(MOZILLA_DIR)/ipc/app/defs.mk
-
 DIST_FILES += $(MOZ_CHILD_PROCESS_NAME)
 
 ifeq ($(CPU_ARCH),x86)
 ABI_DIR = x86
 else
 ifdef MOZ_THUMB2
 ABI_DIR = armeabi-v7a
 else