Remove owning_id from EffectNode and replace it by an opaque stable_id

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 6845f0e111c893527bec976f40f4d929b911ae45..25094a209fcdaa2b2a396b56393bb657802b3ad3 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -493,7 +493,7 @@ void Layer::SetOpacity(float opacity) {
   if (layer_tree_host_ && !force_rebuild) {
     PropertyTrees* property_trees = layer_tree_host_->property_trees();
     if (EffectNode* node =
-            property_trees->effect_tree.UpdateNodeFromOwningLayerId(id())) {
+            property_trees->effect_tree.Node(effect_tree_index_)) {
       node->opacity = opacity;
       node->effect_changed = true;
       property_trees->effect_tree.set_needs_update(true);