Add a button to exit managed mode.

chrome/browser/profiles/avatar_menu_model.h

 // 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_BROWSER_PROFILES_AVATAR_MENU_MODEL_H_
 #define CHROME_BROWSER_PROFILES_AVATAR_MENU_MODEL_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 31 matching lines @@
     string16 sync_state;
 
     // Whether or not the current profile is signed in. If true, |sync_state| is
     // expected to be the email of the signed in user.
     bool signed_in;
 
     // The index in the |profile_cache| that this Item represents.
     size_t model_index;
   };
 
-  // Constructor. No parameters can be NULL in practice. |browser| can be NULL
-  // and a new one will be created if an action requires it.
+  // Constructor. |observer| can be NULL. |browser| can be NULL and a new one
+  // will be created if an action requires it.
   AvatarMenuModel(ProfileInfoInterface* profile_cache,
                   AvatarMenuModelObserver* observer,
                   Browser* browser);
   virtual ~AvatarMenuModel();
 
   // Actions performed by the view that the controller forwards back to the
   // model:
   // Opens a Browser with the specified profile in response to the user
   // selecting an item. If |always_create| is true then a new window is created
   // even if a window for that profile already exists.
@@ skipping 44 matching lines @@
   // List of built "menu items."
   std::vector<Item*> items_;
 
   // Listens for notifications from the ProfileInfoCache.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(AvatarMenuModel);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_AVATAR_MENU_MODEL_H_