Change ScrollbarLayer to use UI resource

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 43be832f34d105b56e815cb6fd9285f6b45e6283..60767f430c38470c287980e672a0b85684127617 100644
--- a/cc/test/fake_scrollbar_layer.h
+++ b/cc/test/fake_scrollbar_layer.h
@@ -23,12 +23,6 @@ class FakeScrollbarLayer : public ScrollbarLayer {
 
   int update_count() const { return update_count_; }
   void reset_update_count() { update_count_ = 0; }
-  size_t last_update_full_upload_size() const {
-    return last_update_full_upload_size_;
-  }
-  size_t last_update_partial_upload_size() const {
-    return last_update_partial_upload_size_;
-  }
 
   virtual bool Update(ResourceUpdateQueue* queue,
                       const OcclusionTracker* occlusion) OVERRIDE;
@@ -48,8 +42,6 @@ class FakeScrollbarLayer : public ScrollbarLayer {
 
   int update_count_;
   size_t push_properties_count_;
-  size_t last_update_full_upload_size_;
-  size_t last_update_partial_upload_size_;
 };
 
 }  // namespace cc