cc: Remove code for drawing checkerboard quads, it's not used.

cc/layers/layer.h

Index: cc/layers/layer.h
diff --git a/cc/layers/layer.h b/cc/layers/layer.h
index 4a27aa0fc182556a0ff412cc21053a015ad7b792..a6dabf92a91893aa36aadfb73c4a56fbf852f4cd 100644
--- a/cc/layers/layer.h
+++ b/cc/layers/layer.h
@@ -313,11 +313,6 @@ class CC_EXPORT Layer : public base::RefCounted<Layer>,
     did_scroll_callback_ = callback;
   }
 
-  void SetDrawCheckerboardForMissingTiles(bool checkerboard);
-  bool draw_checkerboard_for_missing_tiles() const {
-    return draw_checkerboard_for_missing_tiles_;
-  }
-
   void SetForceRenderSurface(bool force_render_surface);
   bool force_render_surface() const { return force_render_surface_; }