Remove parts of //cc we aren't using

cc/base/time_util.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_TIME_UTIL_H_
-#define CC_BASE_TIME_UTIL_H_
-
-namespace base {
-class TimeDelta;
-}
-
-namespace cc {
-
-class CC_EXPORT TimeUtil {
- public:
-  static base::TimeDelta Scale(base::TimeDelta time_delta, double value) {
-    return base::TimeDelta::FromInternalValue(static_cast<int64>(
-        static_cast<double>(time_delta.ToInternalValue()) * value));
-  }
-
-  static double Divide(base::TimeDelta dividend, base::TimeDelta divisor) {
-    return static_cast<double>(dividend.ToInternalValue()) /
-           static_cast<double>(divisor.ToInternalValue());
-  }
-
-  static base::TimeDelta Mod(base::TimeDelta dividend,
-                             base::TimeDelta divisor) {
-    return base::TimeDelta::FromInternalValue(dividend.ToInternalValue() %
-                                              divisor.ToInternalValue());
-  }
-};
-
-}  // namespace cc
-
-#endif  // CC_BASE_TIME_UTIL_H_