Fix unused variables errors in cc/.

cc/animation/animation_host.h

 // Copyright 2015 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.
 
 #ifndef CC_ANIMATION_ANIMATION_HOST_H_
 #define CC_ANIMATION_ANIMATION_HOST_H_
 
 #include <vector>
 
 #include "base/containers/scoped_ptr_hash_map.h"
@@ skipping 22 matching lines @@
 // There is just one AnimationHost for LayerTreeHost on main renderer thread
 // and just one AnimationHost for LayerTreeHostImpl on impl thread.
 // We synchronize them during the commit process in a one-way data flow process
 // (PushPropertiesTo).
 // An AnimationHost talks to its correspondent LayerTreeHost via
 // LayerTreeMutatorsClient interface.
 // AnimationHost has it's own instance of AnimationRegistrar,
 // we want to merge AnimationRegistrar into AnimationHost.
 class CC_EXPORT AnimationHost {
  public:
-  static scoped_ptr<AnimationHost> Create(ThreadInstance thread_instance);
+  static scoped_ptr<AnimationHost> Create();
   virtual ~AnimationHost();
 
   void AddAnimationTimeline(scoped_refptr<AnimationTimeline> timeline);
   void RemoveAnimationTimeline(scoped_refptr<AnimationTimeline> timeline);
   AnimationTimeline* GetTimelineById(int timeline_id) const;
 
   void ClearTimelines();
 
   void RegisterLayer(int layer_id, LayerTreeType tree_type);
   void UnregisterLayer(int layer_id, LayerTreeType tree_type);
@@ skipping 60 matching lines @@
   bool HasOnlyTranslationTransforms(int layer_id) const;
   bool AnimationsPreserveAxisAlignment(int layer_id) const;
 
   bool MaximumTargetScale(int layer_id, float* max_scale) const;
   bool AnimationStartScale(int layer_id, float* start_scale) const;
 
   bool HasAnyAnimation(int layer_id) const;
   bool HasActiveAnimation(int layer_id) const;
 
  private:
-  explicit AnimationHost(ThreadInstance thread_instance);
+  AnimationHost();
 
   void PushTimelinesToImplThread(AnimationHost* host_impl) const;
   void RemoveTimelinesFromImplThread(AnimationHost* host_impl) const;
   void PushPropertiesToImplThread(AnimationHost* host_impl);
 
   void EraseTimelines(AnimationTimelineList::iterator begin,
                       AnimationTimelineList::iterator end);
 
   // TODO(loyso): For now AnimationPlayers share LayerAnimationController object
   // if they are attached to the same element(layer). Note that Element can
   // contain many Layers.
   typedef base::ScopedPtrHashMap<int, scoped_ptr<ElementAnimations>>
       LayerToElementAnimationsMap;
   LayerToElementAnimationsMap layer_to_element_animations_map_;
 
   AnimationTimelineList timelines_;
   scoped_ptr<AnimationRegistrar> animation_registrar_;
   MutatorHostClient* mutator_host_client_;
 
-  const ThreadInstance thread_instance_;
-
   DISALLOW_COPY_AND_ASSIGN(AnimationHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_HOST_H_