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

ui/base/models/accelerator.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 "views/accelerator.h"
+#include "ui/base/models/accelerator.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #elif defined(TOOLKIT_USES_GTK)
 #include <gdk/gdk.h>
 #endif
 
 #include "base/i18n/rtl.h"
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/utf_string_conversions.h"
 #include "grit/ui_strings.h"
 #include "ui/base/l10n/l10n_util.h"
 
-namespace views {
+namespace ui {
 
 string16 Accelerator::GetShortcutText() const {
   int string_id = 0;
   switch(key_code_) {
     case ui::VKEY_TAB:
       string_id = IDS_APP_TAB_KEY;
       break;
     case ui::VKEY_RETURN:
       string_id = IDS_APP_ENTER_KEY;
       break;
@@ skipping 122 matching lines @@
     shortcut_rtl.append(ASCIIToUTF16("+"));
 
     // Subtracting the size of the shortcut key and 1 for the '+' sign.
     shortcut_rtl.append(shortcut, 0, shortcut.length() - key_length - 1);
     shortcut.swap(shortcut_rtl);
   }
 
   return shortcut;
 }
 
-}  // namespace views
+}  // namespace ui