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

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index e3c7b9c23610df2a24252c67c13b3041a0672bd5..0124bb925ecaebd9a88af7c650eb588c63927842 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -110,7 +110,6 @@
 class BrowserPluginManager;
 class CacheStorageDispatcher;
 class ChildGpuMemoryBufferManager;
-class ChildSharedBitmapManager;
 class CompositorForwardingMessageFilter;
 class ContextProviderCommandBuffer;
 class DBMessageFilter;
@@ -353,11 +352,6 @@
     return vc_manager_.get();
   }
 
-  ChildSharedBitmapManager* shared_bitmap_manager() const {
-    DCHECK(shared_bitmap_manager_);
-    return shared_bitmap_manager_.get();
-  }
-
   mojom::RenderFrameMessageFilter* render_frame_message_filter();
   mojom::RenderMessageFilter* render_message_filter();
   const scoped_refptr<mojom::ThreadSafeRenderMessageFilterAssociatedPtr>&
@@ -615,8 +609,6 @@
   std::unique_ptr<ThreadSafeAssociatedInterfacePtrProvider>
       thread_safe_associated_interface_ptr_provider_;
 
-  std::unique_ptr<ChildSharedBitmapManager> shared_bitmap_manager_;
-
   // The count of RenderWidgets running through this thread.
   int widget_count_;