Reland of placing allocate bitmap IPC messages with a new Mojo interface.

content/child/child_thread_impl.cc

Index: content/child/child_thread_impl.cc
diff --git a/content/child/child_thread_impl.cc b/content/child/child_thread_impl.cc
index 2fba1bee8a04cd46510cc2a77c281ca2774dee5b..b62412f285267a0e9edcbb3707889c9448a54302 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -36,7 +36,6 @@
 #include "content/child/child_histogram_message_filter.h"
 #include "content/child/child_process.h"
 #include "content/child/child_resource_message_filter.h"
-#include "content/child/child_shared_bitmap_manager.h"
 #include "content/child/fileapi/file_system_dispatcher.h"
 #include "content/child/fileapi/webfilesystem_impl.h"
 #include "content/child/memory/child_memory_message_filter.h"
@@ -561,9 +560,6 @@
 #if defined(OS_ANDROID)
   g_quit_closure.Get().BindToMainThread();
 #endif
-
-  shared_bitmap_manager_.reset(
-      new ChildSharedBitmapManager(thread_safe_sender()));
 }
 
 ChildThreadImpl::~ChildThreadImpl() {