Remove WeakPtrFactory from LayerAnimationSequence

ui/compositor/layer_animation_sequence.h

 // Copyright (c) 2012 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 UI_COMPOSITOR_LAYER_ANIMATION_SEQUENCE_H_
 #define UI_COMPOSITOR_LAYER_ANIMATION_SEQUENCE_H_
 
 #include <stddef.h>
 
 #include <memory>
@@ skipping 179 matching lines @@
   // These parties are notified when layer animations end.
   base::ObserverList<LayerAnimationObserver> observers_;
 
   // Tracks the last_progressed_fraction() of the most recently progressed
   // element.
   double last_progressed_fraction_;
 
   // Used to tag animation elements to obtain metrics of animation performance.
   AnimationMetricsReporter* animation_metrics_reporter_;
 
-  base::WeakPtrFactory<LayerAnimationSequence> weak_ptr_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(LayerAnimationSequence);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_LAYER_ANIMATION_SEQUENCE_H_