CC Animation: Erase LayerAnimationEventObserver.

cc/animation/element_animations.cc

Index: cc/animation/element_animations.cc
diff --git a/cc/animation/element_animations.cc b/cc/animation/element_animations.cc
index 8b07e4ed99c8bbd08b6201567c1995f3bb63715c..6cf9ea35ce2a6313a49c3ae3f9ec2dfd64af331d 100644
--- a/cc/animation/element_animations.cc
+++ b/cc/animation/element_animations.cc
@@ -143,11 +143,6 @@ Animation* ElementAnimations::GetAnimationById(int animation_id) const {
   return layer_animation_controller_->GetAnimationById(animation_id);
 }
 
-void ElementAnimations::SetEventObserver(
-    LayerAnimationEventObserver* observer) {
-  layer_animation_controller_->SetEventObserver(observer);
-}
-
 void ElementAnimations::OnFilterAnimated(LayerTreeType tree_type,
                                          const FilterOperations& filters) {
   DCHECK(layer_id());