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

extensions/common/api/system_network.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.network</code> API.
-namespace system.network {
+[use_movable_types=true] namespace system.network {
   dictionary NetworkInterface {
     // The underlying name of the adapter. On *nix, this will typically be
     // "eth0", "wlan0", etc.
     DOMString name;
 
     // The available IPv4/6 address.
     DOMString address;
 
     // The prefix length
     long prefixLength;
   };
 
   // Callback from the <code>getNetworkInterfaces</code> method.
   // |networkInterfaces| : Array of object containing network interfaces
   // information.
   callback GetNetworkInterfacesCallback =
       void (NetworkInterface[] networkInterfaces);
 
   interface Functions {
     // Retrieves information about local adapters on this system.
     // |callback| : Called when local adapter information is available.
     static void getNetworkInterfaces(GetNetworkInterfacesCallback callback);
   };
 };