[Extensions] Convert APIs to use movable types [10]

chrome/common/extensions/api/webrtc_desktop_capture_private.idl

 // Copyright 2015 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.webrtcDesktopCapturePrivate</code> API to capture
 // desktop media requested from a WebView.
-namespace webrtcDesktopCapturePrivate {
+[use_movable_types=true] namespace webrtcDesktopCapturePrivate {
   dictionary RequestInfo {
     // The guest process id for the requester.
     long guestProcessId;
 
     // The webview render frame id for the requester.
     long guestRenderFrameId;
   };
 
   enum DesktopCaptureSourceType {
     screen,
     window,
     tab
   };
 
   callback chooseDesktopMediaCallback = void (DOMString streamId);
 
   interface Functions {
     // Shows desktop media picker UI with the specified set of sources.
     static long chooseDesktopMedia(DesktopCaptureSourceType[] sources,
                                    RequestInfo request,
                                    chooseDesktopMediaCallback callback);
 
     // Hides desktop media picker dialog shown by chooseDesktopMedia().
     static void cancelChooseDesktopMedia(long desktopMediaRequestId);
   };
 };