Revert of Replacing allocate bitmap IPC messages with a new Mojo interface.

content/child/child_thread_impl.h

Index: content/child/child_thread_impl.h
diff --git a/content/child/child_thread_impl.h b/content/child/child_thread_impl.h
index 592a02341a26cbbcb7a9f76bd40aba908a29472c..9cdc07bf1200ae400af21e47dbdbe790aa9e985c 100644
--- a/content/child/child_thread_impl.h
+++ b/content/child/child_thread_impl.h
@@ -51,6 +51,7 @@
 namespace content {
 class ChildHistogramMessageFilter;
 class ChildResourceMessageFilter;
+class ChildSharedBitmapManager;
 class FileSystemDispatcher;
 class InProcessChildThreadParams;
 class NotificationDispatcher;
@@ -129,6 +130,10 @@
                          base::ThreadPriority priority);
 #endif
 
+  ChildSharedBitmapManager* shared_bitmap_manager() const {
+    return shared_bitmap_manager_.get();
+  }
+
   ResourceDispatcher* resource_dispatcher() const {
     return resource_dispatcher_.get();
   }
@@ -311,6 +316,8 @@
 
   scoped_refptr<PushDispatcher> push_dispatcher_;
 
+  std::unique_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
+
   std::unique_ptr<base::PowerMonitor> power_monitor_;
 
   scoped_refptr<base::SingleThreadTaskRunner> browser_process_io_runner_;