[Extensions] Convert APIs to use movable types [13]

extensions/common/api/system_storage.idl

 // Copyright 2013 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.
 
 // Use the <code>chrome.system.storage</code> API to query storage device
 // information and be notified when a removable storage device is attached and
 // detached.
-namespace system.storage {
+[use_movable_types=true] namespace system.storage {
 
   enum StorageUnitType {
     // The storage has fixed media, e.g. hard disk or SSD.
     fixed,
     // The storage is removable, e.g. USB flash drive.
     removable,
     // The storage type is unknown.
     unknown
   };
 
@@ skipping 55 matching lines @@
 
   interface Events {
     // Fired when a new removable storage is attached to the system.
     static void onAttached(StorageUnitInfo info);
 
     // Fired when a removable storage is detached from the system.
     static void onDetached(DOMString id);
   };
 
 };