cc: Remove unused proto conversion code.

cc/test/fake_remote_compositor_bridge.cc

Index: cc/test/fake_remote_compositor_bridge.cc
diff --git a/cc/test/fake_remote_compositor_bridge.cc b/cc/test/fake_remote_compositor_bridge.cc
index a6750ec4f363f191e0b64b8bc42c41d6bfd4f378..9288c3fb7b4f1e74d365955793e37e0acb214b41 100644
--- a/cc/test/fake_remote_compositor_bridge.cc
+++ b/cc/test/fake_remote_compositor_bridge.cc
@@ -26,12 +26,18 @@ void FakeRemoteCompositorBridge::BindToClient(
 }
 
 void FakeRemoteCompositorBridge::ScheduleMainFrame() {
+  DCHECK(!has_pending_update_);
+  has_pending_update_ = true;
+
   compositor_main_task_runner_->PostTask(
       FROM_HERE, base::Bind(&FakeRemoteCompositorBridge::BeginMainFrame,
                             weak_factory_.GetWeakPtr()));
 }
 
 void FakeRemoteCompositorBridge::BeginMainFrame() {
+  DCHECK(has_pending_update_);
+  has_pending_update_ = false;
+
   client_->BeginMainFrame();
 }