cc: Remove the base RasterSource

cc/raster/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_RASTER_RASTER_BUFFER_H_
 #define CC_RASTER_RASTER_BUFFER_H_
 
 #include "cc/base/cc_export.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
-class RasterSource;
+class DisplayListRasterSource;
 
 class CC_EXPORT RasterBuffer {
  public:
   RasterBuffer();
   virtual ~RasterBuffer();
 
-  virtual void Playback(const RasterSource* raster_source,
+  virtual void Playback(const DisplayListRasterSource* raster_source,
                         const gfx::Rect& raster_full_rect,
                         const gfx::Rect& raster_dirty_rect,
                         uint64_t new_content_id,
                         float scale,
                         bool include_images) = 0;
 };
 
 }  // namespace cc
 
 #endif  // CC_RASTER_RASTER_BUFFER_H_