cc : Track ids for which active opacity always wins on property trees

cc/layers/scrollbar_layer_impl_base.cc

Index: cc/layers/scrollbar_layer_impl_base.cc
diff --git a/cc/layers/scrollbar_layer_impl_base.cc b/cc/layers/scrollbar_layer_impl_base.cc
index e8e0f80a18c47aa416c8c1739bfeb21722c8f389..25dd0add085fd598d89a261223ec8935799e82ba 100644
--- a/cc/layers/scrollbar_layer_impl_base.cc
+++ b/cc/layers/scrollbar_layer_impl_base.cc
@@ -40,11 +40,6 @@ void ScrollbarLayerImplBase::PushPropertiesTo(LayerImpl* layer) {
   layer->ToScrollbarLayer()->SetScrollLayerId(ScrollLayerId());
 }
 
-void ScrollbarLayerImplBase::DidBecomeActive() {
-  LayerImpl::DidBecomeActive();
-  UpdatePropertyTreeOpacity();
-}
-
 ScrollbarLayerImplBase* ScrollbarLayerImplBase::ToScrollbarLayer() {
   return this;
 }