cc: Switch RenderingStats collection in Layer::Update() to RenderingStatsInstrumentation

cc/test/fake_scrollbar_layer.h

Index: cc/test/fake_scrollbar_layer.h
diff --git a/cc/test/fake_scrollbar_layer.h b/cc/test/fake_scrollbar_layer.h
index f06f752bc8a426944da0d54b2659bc4d3ff6c219..8d0d6240a61d8eb3e883fd5dd66c0aa0ed071468 100644
--- a/cc/test/fake_scrollbar_layer.h
+++ b/cc/test/fake_scrollbar_layer.h
@@ -29,8 +29,7 @@ class FakeScrollbarLayer : public ScrollbarLayer {
   }
 
   virtual void Update(ResourceUpdateQueue* queue,
-                      const OcclusionTracker* occlusion,
-                      RenderingStats* stats) OVERRIDE;
+                      const OcclusionTracker* occlusion) OVERRIDE;
 
  private:
   FakeScrollbarLayer(bool paint_during_update,