cc: Clean up LayerTreeTest and TestHooks.

cc/test/remote_channel_impl_for_test.h

-// 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.
-
-#ifndef CC_TEST_REMOTE_CHANNEL_IMPL_FOR_TEST_H_
-#define CC_TEST_REMOTE_CHANNEL_IMPL_FOR_TEST_H_
-
-#include "base/macros.h"
-#include "cc/test/proxy_impl_for_test.h"
-#include "cc/test/test_hooks.h"
-#include "cc/trees/remote_channel_impl.h"
-
-namespace cc {
-
-class RemoteChannelImplForTest : public RemoteChannelImpl {
- public:
-  static std::unique_ptr<RemoteChannelImplForTest> Create(
-      TestHooks* test_hooks,
-      LayerTreeHost* layer_tree_host,
-      RemoteProtoChannel* remote_proto_channel,
-      TaskRunnerProvider* task_runner_provider);
-
-  ProxyImplForTest* proxy_impl_for_test() const { return proxy_impl_for_test_; }
-
- private:
-  RemoteChannelImplForTest(TestHooks* test_hooks,
-                           LayerTreeHost* layer_tree_host,
-                           RemoteProtoChannel* remote_proto_channel,
-                           TaskRunnerProvider* task_runner_provider);
-
-  std::unique_ptr<ProxyImpl> CreateProxyImpl(
-      ChannelImpl* channel_impl,
-      LayerTreeHost* layer_tree_host,
-      TaskRunnerProvider* task_runner_provider,
-      std::unique_ptr<BeginFrameSource> external_begin_frame_source) override;
-
-  TestHooks* test_hooks_;
-  ProxyImplForTest* proxy_impl_for_test_;
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_REMOTE_CHANNEL_IMPL_FOR_TEST_H_