Remove forward declarations of non-existent class.

cc/input/input_handler.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_INPUT_INPUT_HANDLER_H_
 #define CC_INPUT_INPUT_HANDLER_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 13 matching lines @@
 class Vector2d;
 class Vector2dF;
 }
 
 namespace ui {
 class LatencyInfo;
 }
 
 namespace cc {
 
-class LayerScrollOffsetDelegate;
 class ScrollElasticityHelper;
 
 struct CC_EXPORT InputHandlerScrollResult {
   InputHandlerScrollResult();
   // Did any layer scroll as a result this ScrollBy call?
   bool did_scroll;
   // Was any of the scroll delta argument to this ScrollBy call not used?
   bool did_overscroll_root;
   // The total overscroll that has been accumulated by all ScrollBy calls that
   // have had overscroll since the last ScrollBegin call. This resets upon a
@@ skipping 158 matching lines @@
   InputHandler() {}
   virtual ~InputHandler() {}
 
  private:
   DISALLOW_COPY_AND_ASSIGN(InputHandler);
 };
 
 }  // namespace cc
 
 #endif  // CC_INPUT_INPUT_HANDLER_H_