Remove all fling related stuff from the renderer assuming that browser side

cc/layers/layer_impl.h

 // Copyright 2011 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_IMPL_H_
 #define CC_LAYERS_LAYER_IMPL_H_
 
 #include <set>
 #include <string>
 
@@ skipping 331 matching lines @@
   virtual void CalculateContentsScale(float ideal_contents_scale,
                                       float device_scale_factor,
                                       float page_scale_factor,
                                       bool animating_transform_to_screen,
                                       float* contents_scale_x,
                                       float* contents_scale_y,
                                       gfx::Size* content_bounds);
 
   void SetScrollOffsetDelegate(
       LayerScrollOffsetDelegate* scroll_offset_delegate);
-  bool IsExternalFlingActive() const;
 
   void SetScrollOffset(gfx::Vector2d scroll_offset);
   void SetScrollOffsetAndDelta(gfx::Vector2d scroll_offset,
                                gfx::Vector2dF scroll_delta);
   gfx::Vector2d scroll_offset() const { return scroll_offset_; }
 
   void SetMaxScrollOffset(gfx::Vector2d max_scroll_offset);
   gfx::Vector2d max_scroll_offset() const { return max_scroll_offset_; }
 
   void SetScrollDelta(gfx::Vector2dF scroll_delta);
@@ skipping 264 matching lines @@
   // Group of properties that need to be computed based on the layer tree
   // hierarchy before layers can be drawn.
   DrawProperties<LayerImpl> draw_properties_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_LAYERS_LAYER_IMPL_H_