Remove parts of //cc we aren't using

cc/animation/animation_events.cc

-// Copyright 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 "cc/animation/animation_events.h"
-
-namespace cc {
-
-AnimationEvent::AnimationEvent(AnimationEvent::Type type,
-                               int layer_id,
-                               int group_id,
-                               Animation::TargetProperty target_property,
-                               base::TimeTicks monotonic_time)
-    : type(type),
-      layer_id(layer_id),
-      group_id(group_id),
-      target_property(target_property),
-      monotonic_time(monotonic_time),
-      is_impl_only(false),
-      opacity(0.f) {
-}
-
-}  // namespace cc