Remove Layer{Impl}::FilterIsAnimating.

cc/layers/layer.h

 // Copyright 2010 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_LAYERS_LAYER_H_
 #define CC_LAYERS_LAYER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 454 matching lines @@
   friend class LayerTreeHostCommon;
   friend class LayerTreeHost;
 
   // Interactions with attached animations.
   gfx::ScrollOffset ScrollOffsetForAnimation() const;
   void OnFilterAnimated(const FilterOperations& filters);
   void OnOpacityAnimated(float opacity);
   void OnTransformAnimated(const gfx::Transform& transform);
   void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset);
 
-  bool FilterIsAnimating() const;
   bool TransformIsAnimating() const;
   bool ScrollOffsetAnimationWasInterrupted() const;
 
   void AddScrollChild(Layer* child);
   void RemoveScrollChild(Layer* child);
 
   void AddClipChild(Layer* child);
   void RemoveClipChild(Layer* child);
 
   void SetParent(Layer* layer);
@@ skipping 142 matching lines @@
   // These all act like draw properties, so don't need push properties.
   gfx::Rect visible_layer_rect_;
   size_t num_unclipped_descendants_;
 
   DISALLOW_COPY_AND_ASSIGN(Layer);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_H_