Update from https://crrev.com/318214

cc/animation/scrollbar_animation_controller_linear_fade.h

 // Copyright 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 CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
 #define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/animation/scrollbar_animation_controller.h"
 #include "cc/base/cc_export.h"
@@ skipping 22 matching lines @@
       base::TimeDelta delay_before_starting,
       base::TimeDelta resize_delay_before_starting,
       base::TimeDelta duration);
 
   void RunAnimationFrame(float progress) override;
 
  private:
   float OpacityAtTime(base::TimeTicks now) const;
   void ApplyOpacityToScrollbars(float opacity);
 
-  LayerImpl* scroll_layer_;
-
   DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerLinearFade);
 };
 
 }  // namespace cc
 
 #endif  // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_LINEAR_FADE_H_