cc: Remove unused proto conversion code.

cc/test/fake_remote_compositor_bridge.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "cc/test/fake_remote_compositor_bridge.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "cc/blimp/remote_compositor_bridge_client.h"
 
 namespace cc {
 
 FakeRemoteCompositorBridge::FakeRemoteCompositorBridge(
     scoped_refptr<base::SingleThreadTaskRunner> compositor_main_task_runner)
     : RemoteCompositorBridge(std::move(compositor_main_task_runner)),
       client_(nullptr),
       weak_factory_(this) {}
 
 FakeRemoteCompositorBridge::~FakeRemoteCompositorBridge() {}
 
 void FakeRemoteCompositorBridge::BindToClient(
     RemoteCompositorBridgeClient* client) {
   DCHECK(!client_);
   client_ = client;
 }
 
 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();
 }
 
 }  // namespace cc