Remove parts of //cc we aren't using

cc/resources/raster_buffer.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_RESOURCES_RASTER_BUFFER_H_
-#define CC_RESOURCES_RASTER_BUFFER_H_
-
-#include "cc/base/cc_export.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace cc {
-class RasterSource;
-
-class CC_EXPORT RasterBuffer {
- public:
-  RasterBuffer();
-  virtual ~RasterBuffer();
-
-  virtual void Playback(const RasterSource* raster_source,
-                        const gfx::Rect& rect,
-                        float scale) = 0;
-};
-
-}  // namespace cc
-
-#endif  // CC_RESOURCES_RASTER_BUFFER_H_