Don't use browser windows for platform app shell windows

chrome/common/chrome_view_type.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 CHROME_COMMON_CHROME_VIEW_TYPE_H_
 #define CHROME_COMMON_CHROME_VIEW_TYPE_H_
 #pragma once
 
 #include "content/public/common/view_type.h"
 
 namespace chrome {
 
 // Indicates different types of views.
 enum ViewType {
   VIEW_TYPE_CHROME_START = content::VIEW_TYPE_CONTENT_END,
 
   VIEW_TYPE_BACKGROUND_CONTENTS,
   VIEW_TYPE_EXTENSION_BACKGROUND_PAGE,
   VIEW_TYPE_EXTENSION_POPUP,
   VIEW_TYPE_EXTENSION_INFOBAR,
   VIEW_TYPE_NOTIFICATION,
   VIEW_TYPE_EXTENSION_DIALOG,
+  VIEW_TYPE_APP_SHELL,
 };
 
 // Constant strings corresponding to the Type enumeration values.  Used
 // when converting JS arguments.
 extern const char kViewTypeTabContents[];
 extern const char kViewTypeBackgroundPage[];
 extern const char kViewTypePopup[];
 extern const char kViewTypeInfobar[];
 extern const char kViewTypeNotification[];
 extern const char kViewTypeExtensionDialog[];
+extern const char kViewTypeAppShell[];
 extern const char kViewTypeAll[];
 
 }  // namespace chrome
 
 #endif  // CHROME_COMMON_CHROME_VIEW_TYPE_H_