CC Animation: Erase LayerAnimationEventObserver.

cc/animation/layer_animation_controller.cc

Index: cc/animation/layer_animation_controller.cc
diff --git a/cc/animation/layer_animation_controller.cc b/cc/animation/layer_animation_controller.cc
index c722dc59af2bb56d92c640f4e6ed505b0efb9457..21a88508e346a3c4a6780ba223b1f080bfe22f53 100644
--- a/cc/animation/layer_animation_controller.cc
+++ b/cc/animation/layer_animation_controller.cc
@@ -28,7 +28,6 @@ LayerAnimationController::LayerAnimationController(int id)
     : host_(0),
       id_(id),
       is_active_(false),
-      event_observer_(nullptr),
       value_observer_(nullptr),
       value_provider_(nullptr),
       layer_animation_delegate_(nullptr),
@@ -391,8 +390,6 @@ void LayerAnimationController::SetAnimationHost(AnimationHost* host) {
 void LayerAnimationController::NotifyAnimationStarted(
     const AnimationEvent& event) {
   if (event.is_impl_only) {
-    if (event_observer_)
-      event_observer_->OnAnimationStarted(event);
     if (layer_animation_delegate_)
       layer_animation_delegate_->NotifyAnimationStarted(
           event.monotonic_time, event.target_property, event.group_id);
@@ -407,8 +404,6 @@ void LayerAnimationController::NotifyAnimationStarted(
       if (!animations_[i]->has_set_start_time())
         animations_[i]->set_start_time(event.monotonic_time);
 
-      if (event_observer_)
-        event_observer_->OnAnimationStarted(event);
       if (layer_animation_delegate_)
         layer_animation_delegate_->NotifyAnimationStarted(
             event.monotonic_time, event.target_property, event.group_id);
@@ -489,11 +484,6 @@ void LayerAnimationController::NotifyAnimationPropertyUpdate(
   }
 }
 
-void LayerAnimationController::SetEventObserver(
-    LayerAnimationEventObserver* observer) {
-  event_observer_ = observer;
-}
-
 bool LayerAnimationController::HasFilterAnimationThatInflatesBounds() const {
   for (size_t i = 0; i < animations_.size(); ++i) {
     if (!animations_[i]->is_finished() &&