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

ui/views/window/dialog_client_view.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 UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_
 #define UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_
 #pragma once
 
 #include "ui/gfx/font.h"
 #include "views/focus/focus_manager.h"
@@ skipping 71 matching lines @@
                                 View* focused_now) OVERRIDE;
 
  protected:
   // View overrides:
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
   virtual void PaintChildren(gfx::Canvas* canvas) OVERRIDE;
   virtual void Layout() OVERRIDE;
   virtual void ViewHierarchyChanged(bool is_add, View* parent,
                                     View* child) OVERRIDE;
   virtual gfx::Size GetPreferredSize() OVERRIDE;
-  virtual bool AcceleratorPressed(const Accelerator& accelerator) OVERRIDE;
+  virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
 
   // ButtonListener implementation:
   virtual void ButtonPressed(Button* sender,
                              const views::Event& event) OVERRIDE;
 
  private:
   // Paint the size box in the bottom right corner of the window if it is
   // resizable.
   void PaintSizeBox(gfx::Canvas* canvas);
 
@@ skipping 58 matching lines @@
 
   // Static resource initialization
   static gfx::Font* dialog_button_font_;
 
   DISALLOW_COPY_AND_ASSIGN(DialogClientView);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WINDOW_DIALOG_CLIENT_VIEW_H_