cc: Remove unused proto conversion code.

cc/test/fake_remote_compositor_bridge.h

Index: cc/test/fake_remote_compositor_bridge.h
diff --git a/cc/test/fake_remote_compositor_bridge.h b/cc/test/fake_remote_compositor_bridge.h
index eda4798e5d6173c855b86ee47105edcdd8f6ae1b..6b4a68d65e8ae368f10d6269e750ffffa8cbae9b 100644
--- a/cc/test/fake_remote_compositor_bridge.h
+++ b/cc/test/fake_remote_compositor_bridge.h
@@ -29,10 +29,15 @@ class FakeRemoteCompositorBridge : public RemoteCompositorBridge {
   void ProcessCompositorStateUpdate(
       std::unique_ptr<CompositorProtoState> compositor_proto_state) override {}
 
+  bool has_pending_update() const { return has_pending_update_; }
+
  protected:
   void BeginMainFrame();
 
   RemoteCompositorBridgeClient* client_;
+
+ private:
+  bool has_pending_update_ = false;
   base::WeakPtrFactory<FakeRemoteCompositorBridge> weak_factory_;
 };