Replacing 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 7f2755b3e00f3859bfe499adb57561c2686db6ca..06b3f53be4cf23c1d804ff185f1e2fcab49d60dc 100644
--- a/content/child/child_thread_impl.cc
+++ b/content/child/child_thread_impl.cc
@@ -37,7 +37,6 @@
 #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"
@@ -591,9 +590,6 @@ void ChildThreadImpl::Init(const Options& options) {
   g_quit_closure.Get().BindToMainThread();
 #endif
 
-  shared_bitmap_manager_.reset(
-      new ChildSharedBitmapManager(thread_safe_sender()));
-
   client_discardable_shared_memory_manager_delegate_ =
       base::MakeUnique<ClientDiscardableSharedMemoryManagerDelegate>(
           thread_safe_sender());