Remove parts of //cc we aren't using

cc/debug/picture_record_benchmark.h

-// Copyright 2013 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_PICTURE_RECORD_BENCHMARK_H_
-#define CC_DEBUG_PICTURE_RECORD_BENCHMARK_H_
-
-#include <map>
-#include <utility>
-#include <vector>
-
-#include "base/time/time.h"
-#include "cc/debug/micro_benchmark_controller.h"
-
-namespace cc {
-
-class LayerTreeHost;
-class Layer;
-class CC_EXPORT PictureRecordBenchmark : public MicroBenchmark {
- public:
-  explicit PictureRecordBenchmark(scoped_ptr<base::Value> value,
-                                  const MicroBenchmark::DoneCallback& callback);
-  ~PictureRecordBenchmark() override;
-
-  // Implements MicroBenchmark interface.
-  void DidUpdateLayers(LayerTreeHost* host) override;
-  void RunOnLayer(PictureLayer* layer) override;
-
- private:
-  typedef std::pair<base::TimeDelta, unsigned> TotalTime;
-  std::map<std::pair<int, int>, TotalTime> times_;
-  std::vector<std::pair<int, int>> dimensions_;
-};
-
-}  // namespace cc
-
-#endif  // CC_DEBUG_PICTURE_RECORD_BENCHMARK_H_