CC Animation: Erase LayerAnimationEventObserver.

ui/compositor/test/layer_animator_test_controller.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stddef.h>
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_events.h"
 #include "ui/compositor/layer_animation_sequence.h"
 #include "ui/compositor/test/layer_animator_test_controller.h"
@@ skipping 32 matching lines @@
       continue;
 
     LayerAnimationElement* element = sequence->CurrentElement();
     if (!(element->properties() & animatable_property))
       continue;
 
     if (!element->Started() ||
         element->effective_start_time() != base::TimeTicks())
       continue;
 
-    animator_->OnThreadedAnimationStarted(cc::AnimationEvent(
-        cc::AnimationEvent::STARTED, 0, element->animation_group_id(),
-        threaded_properties[i], base::TimeTicks::Now()));
+    animator_->OnThreadedAnimationStarted(base::TimeTicks::Now(),
+                                          threaded_properties[i],
+                                          element->animation_group_id());
   }
 }
 
 void LayerAnimatorTestController::Step(const base::TimeDelta& duration) {
   animator_->Step(animator_->last_step_time() + duration);
 }
 
 }  // namespace ui