UI Compositor Animation: Remove cc::ElementAnimations state storage.

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 <memory>
 #include <unordered_map>
 
@@ skipping 147 matching lines @@
   ScrollOffsetAnimations& scroll_offset_animations() const;
 
   // Registers the given element animations as active. An active element
   // animations is one that has a running animation that needs to be ticked.
   void DidActivateElementAnimations(ElementAnimations* element_animations);
 
   // Unregisters the given element animations. When this happens, the
   // element animations will no longer be ticked (since it's not active).
   void DidDeactivateElementAnimations(ElementAnimations* element_animations);
 
-  // Registers the given ElementAnimations as alive.
-  void RegisterElementAnimations(ElementAnimations* element_animations);
-  // Unregisters the given ElementAnimations as alive.
-  void UnregisterElementAnimations(ElementAnimations* element_animations);
-
   const ElementToAnimationsMap& active_element_animations_for_testing() const;
   const ElementToAnimationsMap& all_element_animations_for_testing() const;
 
  private:
   explicit AnimationHost(ThreadInstance thread_instance);
 
   void PushTimelinesToImplThread(AnimationHost* host_impl) const;
   void RemoveTimelinesFromImplThread(AnimationHost* host_impl) const;
   void PushPropertiesToImplThread(AnimationHost* host_impl);
 
@@ skipping 16 matching lines @@
 
   bool supports_scroll_animations_;
   bool needs_push_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(AnimationHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_ANIMATION_HOST_H_