Remove parts of //cc we aren't using

cc/debug/invalidation_benchmark.h

-// Copyright 2014 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_DEBUG_INVALIDATION_BENCHMARK_H_
-#define CC_DEBUG_INVALIDATION_BENCHMARK_H_
-
-#include <string>
-
-#include "cc/debug/micro_benchmark_controller.h"
-
-namespace cc {
-
-class LayerTreeHost;
-class Layer;
-// NOTE: this benchmark will not measure or return any results, it will simply
-// invalidate a certain area of each layer every frame. It is intended to be
-// used in combination with a telemetry benchmark that does the actual
-// measurement.
-class CC_EXPORT InvalidationBenchmark : public MicroBenchmark {
- public:
-  explicit InvalidationBenchmark(scoped_ptr<base::Value> value,
-                                 const MicroBenchmark::DoneCallback& callback);
-  ~InvalidationBenchmark() override;
-
-  // Implements MicroBenchmark interface.
-  void DidUpdateLayers(LayerTreeHost* host) override;
-  void RunOnLayer(PictureLayer* layer) override;
-  bool ProcessMessage(scoped_ptr<base::Value> value) override;
-
- private:
-  enum Mode { FIXED_SIZE, LAYER, VIEWPORT, RANDOM };
-
-  float LCGRandom();
-
-  Mode mode_;
-  int width_;
-  int height_;
-  uint32 seed_;
-};
-
-}  // namespace cc
-
-#endif  // CC_DEBUG_INVALIDATION_BENCHMARK_H_