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

chrome/browser/ui/views/dropdown_bar_host.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/dropdown_bar_host.h"
 
 #include <algorithm>
 
 #include "chrome/browser/ui/view_ids.h"
 #include "chrome/browser/ui/views/dropdown_bar_host_delegate.h"
@@ skipping 317 matching lines @@
     ScopedPlatformRegion exclude_region(exclude_path.CreateNativeRegion());
     region.Set(Path::SubtractRegion(region.Get(), exclude_region.Get()));
   }
 
   // Window takes ownership of the region.
   host()->SetShape(region.release());
 }
 
 void DropdownBarHost::RegisterAccelerators() {
   DCHECK(!esc_accel_target_registered_);
-  views::Accelerator escape(ui::VKEY_ESCAPE, false, false, false);
+  ui::Accelerator escape(ui::VKEY_ESCAPE, false, false, false);
   focus_manager_->RegisterAccelerator(escape, this);
   esc_accel_target_registered_ = true;
 }
 
 void DropdownBarHost::UnregisterAccelerators() {
   DCHECK(esc_accel_target_registered_);
-  views::Accelerator escape(ui::VKEY_ESCAPE, false, false, false);
+  ui::Accelerator escape(ui::VKEY_ESCAPE, false, false, false);
   focus_manager_->UnregisterAccelerator(escape, this);
   esc_accel_target_registered_ = false;
 }