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

chrome/browser/ui/views/bubble/bubble.cc

 // 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.
 
 #include "chrome/browser/ui/views/bubble/bubble.h"
 
 #include <vector>
 
 #include "chrome/browser/ui/views/bubble/border_contents.h"
 #include "chrome/common/chrome_notification_types.h"
@@ skipping 425 matching lines @@
   animation_->SetSlideDuration(kHideFadeDurationMS);
   animation_->SetTweenType(ui::Tween::LINEAR);
 
   animation_->Reset(fade_in ? 0.0 : 1.0);
   if (fade_in)
     animation_->Show();
   else
     animation_->Hide();
 }
 
-bool Bubble::AcceleratorPressed(const views::Accelerator& accelerator) {
+bool Bubble::AcceleratorPressed(const ui::Accelerator& accelerator) {
   if (!delegate_ || delegate_->CloseOnEscape()) {
     DoClose(true);
     return true;
   }
   return false;
 }