[Extensions] Convert APIs to use movable types [11]

extensions/common/api/cast_channel.idl

 // Copyright 2014 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.
 
 // API for communicating with a Google Cast device over an authenticated
 // channel.
-namespace cast.channel {
+[use_movable_types=true] namespace cast.channel {
   // The state of the channel.
   enum ReadyState {
     // The channel is connecting.
     connecting,
     // The channel is open and available for messaging.
     open,
     // The channel is closing.
     closing,
     // The channel is closed.
     closed
@@ skipping 208 matching lines @@
   interface Events {
     // Fired when a message is received on an open channel.
     static void onMessage(ChannelInfo channel,
                           MessageInfo message);
 
     // Fired when an error occurs as a result of a channel operation or a
     // network event. |error| contains details of the error.
     static void onError(ChannelInfo channel, ErrorInfo error);
   };
 };