Remove parts of //cc we aren't using

cc/animation/animation_id_provider.h

-// Copyright (c) 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_ANIMATION_ANIMATION_ID_PROVIDER_H_
-#define CC_ANIMATION_ANIMATION_ID_PROVIDER_H_
-
-#include "base/basictypes.h"
-#include "cc/base/cc_export.h"
-
-namespace cc {
-
-class CC_EXPORT AnimationIdProvider {
- public:
-  // These functions each return monotonically increasing values.
-  static int NextAnimationId();
-  static int NextGroupId();
-
- private:
-  DISALLOW_IMPLICIT_CONSTRUCTORS(AnimationIdProvider);
-};
-
-}  // namespace cc
-
-#endif  // CC_ANIMATION_ANIMATION_ID_PROVIDER_H_