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

content/public/test/mock_render_thread.cc

Index: content/public/test/mock_render_thread.cc
diff --git a/content/public/test/mock_render_thread.cc b/content/public/test/mock_render_thread.cc
index 1003a2bc92fcf7baef4569701a63a4de9649b585..a292f78d752c1b3694b34e80591599086e71c516 100644
--- a/content/public/test/mock_render_thread.cc
+++ b/content/public/test/mock_render_thread.cc
@@ -72,15 +72,6 @@
   void CreateFullscreenWidget(
       int opener_id,
       const CreateFullscreenWidgetCallback& callback) override {
-    NOTREACHED();
-  }
-
-  void AllocatedSharedBitmap(mojo::ScopedSharedBufferHandle buffer,
-                             const cc::SharedBitmapId& id) override {
-    NOTREACHED();
-  }
-
-  void DeletedSharedBitmap(const cc::SharedBitmapId& id) override {
     NOTREACHED();
   }