Move views::Accelerator to ui in order to use it from aura code.

views/controls/button/custom_button.h

 // Copyright (c) 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 VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #define VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_
 #pragma once
 
 #include "ui/base/animation/animation_delegate.h"
 #include "views/controls/button/button.h"
@@ skipping 69 matching lines @@
   virtual std::string GetClassName() const OVERRIDE;
   virtual bool OnMousePressed(const MouseEvent& event) OVERRIDE;
   virtual bool OnMouseDragged(const MouseEvent& event) OVERRIDE;
   virtual void OnMouseReleased(const MouseEvent& event) OVERRIDE;
   virtual void OnMouseCaptureLost() OVERRIDE;
   virtual void OnMouseEntered(const MouseEvent& event) OVERRIDE;
   virtual void OnMouseExited(const MouseEvent& event) OVERRIDE;
   virtual void OnMouseMoved(const MouseEvent& event) OVERRIDE;
   virtual bool OnKeyPressed(const KeyEvent& event) OVERRIDE;
   virtual bool OnKeyReleased(const KeyEvent& event) OVERRIDE;
-  virtual bool AcceleratorPressed(const Accelerator& accelerator) OVERRIDE;
+  virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
   virtual void ShowContextMenu(const gfx::Point& p,
                                bool is_mouse_gesture) OVERRIDE;
   virtual void OnDragDone() OVERRIDE;
   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE;
 
   // Overridden from ui::AnimationDelegate:
   virtual void AnimationProgressed(const ui::Animation* animation) OVERRIDE;
 
  protected:
   // Construct the Button with a Listener. See comment for Button's ctor.
@@ skipping 39 matching lines @@
 
   // See description above setter.
   bool request_focus_on_press_;
 
   DISALLOW_COPY_AND_ASSIGN(CustomButton);
 };
 
 }  // namespace views
 
 #endif  // VIEWS_CONTROLS_BUTTON_CUSTOM_BUTTON_H_