Blink Compositor Animation: Introduce CompositorAnimationHost correctly.

third_party/WebKit/Source/platform/animation/CompositorAnimationTimeline.cpp

 // Copyright 2016 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 "platform/animation/CompositorAnimationTimeline.h"
 
 #include "cc/animation/animation_host.h"
 #include "cc/animation/animation_id_provider.h"
 #include "platform/animation/CompositorAnimationHost.h"
 #include "platform/animation/CompositorAnimationPlayer.h"
@@ skipping 10 matching lines @@
   // compositor shutdown.
   if (m_animationTimeline->animation_host())
     m_animationTimeline->animation_host()->RemoveAnimationTimeline(
         m_animationTimeline);
 }
 
 cc::AnimationTimeline* CompositorAnimationTimeline::animationTimeline() const {
   return m_animationTimeline.get();
 }
 
-CompositorAnimationHost CompositorAnimationTimeline::compositorAnimationHost() {
-  return CompositorAnimationHost(m_animationTimeline->animation_host());
-}
-
 void CompositorAnimationTimeline::playerAttached(
     const blink::CompositorAnimationPlayerClient& client) {
   if (client.compositorPlayer())
     m_animationTimeline->AttachPlayer(
         client.compositorPlayer()->ccAnimationPlayer());
 }
 
 void CompositorAnimationTimeline::playerDestroyed(
     const blink::CompositorAnimationPlayerClient& client) {
   if (client.compositorPlayer())
     m_animationTimeline->DetachPlayer(
         client.compositorPlayer()->ccAnimationPlayer());
 }
 
 }  // namespace blink