Remove parts of //cc we aren't using

cc/base/rolling_time_delta_history.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_BASE_ROLLING_TIME_DELTA_HISTORY_H_
-#define CC_BASE_ROLLING_TIME_DELTA_HISTORY_H_
-
-#include <deque>
-#include <set>
-
-#include "base/time/time.h"
-#include "cc/base/cc_export.h"
-
-namespace cc {
-
-// Stores a limited number of samples. When the maximum size is reached, each
-// insertion results in the deletion of the oldest remaining sample.
-class CC_EXPORT RollingTimeDeltaHistory {
- public:
-  explicit RollingTimeDeltaHistory(size_t max_size);
-
-  ~RollingTimeDeltaHistory();
-
-  void InsertSample(base::TimeDelta time);
-
-  void Clear();
-
-  // Returns the smallest sample that is greater than or equal to the specified
-  // percent of samples. If there aren't any samples, returns base::TimeDelta().
-  base::TimeDelta Percentile(double percent) const;
-
- private:
-  typedef std::multiset<base::TimeDelta> TimeDeltaMultiset;
-
-  TimeDeltaMultiset sample_set_;
-  std::deque<TimeDeltaMultiset::iterator> chronological_sample_deque_;
-  size_t max_size_;
-
-  DISALLOW_COPY_AND_ASSIGN(RollingTimeDeltaHistory);
-};
-
-}  // namespace cc
-
-#endif  // CC_BASE_ROLLING_TIME_DELTA_HISTORY_H_