cc: Remove GetRasterSource from PictureLayerTilingClient.

cc/resources/picture_layer_tiling.h

Index: cc/resources/picture_layer_tiling.h
diff --git a/cc/resources/picture_layer_tiling.h b/cc/resources/picture_layer_tiling.h
index eb47b60ed61cf6736d1b58f6dd0773076942bb41..597c7eca3371aa08626a563fa4416efd38938914 100644
--- a/cc/resources/picture_layer_tiling.h
+++ b/cc/resources/picture_layer_tiling.h
@@ -38,7 +38,6 @@ class CC_EXPORT PictureLayerTilingClient {
   virtual scoped_refptr<Tile> CreateTile(
     PictureLayerTiling* tiling,
     const gfx::Rect& content_rect) = 0;
-  virtual RasterSource* GetRasterSource() = 0;
   virtual gfx::Size CalculateTileSize(
     const gfx::Size& content_bounds) const = 0;
   // This invalidation region defines the area (if any, it can by null) that
@@ -145,7 +144,8 @@ class CC_EXPORT PictureLayerTiling {
       const gfx::Size& layer_bounds,
       PictureLayerTilingClient* client);
   gfx::Size layer_bounds() const { return layer_bounds_; }
-  void UpdateTilesToCurrentRasterSource(const Region& layer_invalidation,
+  void UpdateTilesToCurrentRasterSource(RasterSource* raster_source,
+                                        const Region& layer_invalidation,
                                         const gfx::Size& new_layer_bounds);
   void CreateMissingTilesInLiveTilesRect();
   void RemoveTilesInRegion(const Region& layer_region);