[cc] Unify static create method of ResourceUpdate

cc/resources/resource_update.h

Index: cc/resources/resource_update.h
diff --git a/cc/resources/resource_update.h b/cc/resources/resource_update.h
index 47bef7da189bc3c492e2919a2a3f76ac5d7c419f..a3c810c74ded74030dfbcfed415f83637c17527f 100644
--- a/cc/resources/resource_update.h
+++ b/cc/resources/resource_update.h
@@ -24,18 +24,12 @@ struct CC_EXPORT ResourceUpdate {
                                gfx::Rect content_rect,
                                gfx::Rect source_rect,
                                gfx::Vector2d dest_offset);
-  static ResourceUpdate CreateFromCanvas(PrioritizedResource* resource,
-                                         const skia::RefPtr<SkCanvas>& canvas,
-                                         gfx::Rect content_rect,
-                                         gfx::Rect source_rect,
-                                         gfx::Vector2d dest_offset);
 
   ResourceUpdate();
   virtual ~ResourceUpdate();
 
   PrioritizedResource* texture;
   const SkBitmap* bitmap;
-  skia::RefPtr<SkCanvas> canvas;
   gfx::Rect content_rect;
   gfx::Rect source_rect;
   gfx::Vector2d dest_offset;