Remove parts of //cc we aren't using

cc/test/fake_layer_tree_host_impl.h

-// Copyright 2012 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_LAYER_TREE_HOST_IMPL_H_
-#define CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_H_
-
-#include "cc/test/fake_layer_tree_host_impl_client.h"
-#include "cc/test/fake_rendering_stats_instrumentation.h"
-#include "cc/trees/layer_tree_host_impl.h"
-#include "cc/trees/single_thread_proxy.h"
-
-namespace cc {
-
-class FakeLayerTreeHostImpl : public LayerTreeHostImpl {
- public:
-  FakeLayerTreeHostImpl(Proxy* proxy,
-                        SharedBitmapManager* manager,
-                        TaskGraphRunner* task_graph_runner);
-  FakeLayerTreeHostImpl(const LayerTreeSettings& settings,
-                        Proxy* proxy,
-                        SharedBitmapManager* manager,
-                        TaskGraphRunner* task_graph_runner);
-  ~FakeLayerTreeHostImpl() override;
-
-  void ForcePrepareToDraw() {
-    LayerTreeHostImpl::FrameData frame_data;
-    PrepareToDraw(&frame_data);
-    DidDrawAllLayers(frame_data);
-  }
-
-  void CreatePendingTree() override;
-
-  BeginFrameArgs CurrentBeginFrameArgs() const override;
-  void SetCurrentBeginFrameArgs(const BeginFrameArgs& args);
-  void UpdateNumChildrenAndDrawPropertiesForActiveTree();
-  static void UpdateNumChildrenAndDrawProperties(LayerTreeImpl* layerTree);
-  static int RecursiveUpdateNumChildren(LayerImpl* layer);
-
-  using LayerTreeHostImpl::ActivateSyncTree;
-  using LayerTreeHostImpl::prepare_tiles_needed;
-  using LayerTreeHostImpl::is_likely_to_require_a_draw;
-
- private:
-  BeginFrameArgs current_begin_frame_args_;
-  FakeLayerTreeHostImplClient client_;
-  FakeRenderingStatsInstrumentation stats_instrumentation_;
-};
-
-}  // namespace cc
-
-#endif  // CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_H_