cc: Delete channel abstraction between proxies.

cc/test/fake_channel_impl.h

-// Copyright 2015 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.
-
-#ifndef CC_TEST_FAKE_CHANNEL_IMPL_H_
-#define CC_TEST_FAKE_CHANNEL_IMPL_H_
-
-#include "base/macros.h"
-#include "cc/trees/channel_impl.h"
-
-namespace cc {
-
-class FakeChannelImpl : public ChannelImpl {
- public:
-  FakeChannelImpl();
-
-  ~FakeChannelImpl() override {}
-
-  void DidReceiveCompositorFrameAck() override {}
-  void BeginMainFrameNotExpectedSoon() override {}
-  void DidCommitAndDrawFrame() override {}
-  void SetAnimationEvents(std::unique_ptr<MutatorEvents> queue) override;
-  void DidLoseCompositorFrameSink() override {}
-  void RequestNewCompositorFrameSink() override {}
-  void DidInitializeCompositorFrameSink(bool success) override {}
-  void DidCompletePageScaleAnimation() override {}
-  void BeginMainFrame(std::unique_ptr<BeginMainFrameAndCommitState>
-                          begin_main_frame_state) override {}
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_FAKE_CHANNEL_IMPL_H_