try 3 of: Split out InputMethodMenuManager from InputMethodManager.

chrome/browser/chromeos/input_method/input_method_persistence.cc

 // 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.
 
 #include "chrome/browser/chromeos/input_method/input_method_persistence.h"
 
 #include "base/logging.h"
 #include "base/prefs/pref_service.h"
 #include "base/prefs/scoped_user_pref_update.h"
 #include "base/sys_info.h"
@@ skipping 124 matching lines @@
       return;
     case InputMethodManager::STATE_LOCK_SCREEN:
       // We use a special set of input methods on the screen. Do not update.
       return;
     case InputMethodManager::STATE_TERMINATING:
       return;
   }
   NOTREACHED();
 }
 
-void InputMethodPersistence::InputMethodPropertyChanged(
-    InputMethodManager* manager) {}
-
 void InputMethodPersistence::OnSessionStateChange(
     InputMethodManager::State new_state) {
   state_ = new_state;
 }
 
 }  // namespace input_method
 }  // namespace chromeos