[Extensions] Convert APIs to use movable types [4]

chrome/common/extensions/api/downloads.idl

 // 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.
 
 // Use the <code>chrome.downloads</code> API to programmatically initiate,
 // monitor, manipulate, and search for downloads.
-[permissions=downloads]
+[permissions=downloads,use_movable_types=true]
 namespace downloads {
   [inline_doc] dictionary HeaderNameValuePair {
     // Name of the HTTP header.
     DOMString name;
 
     // Value of the HTTP header.
     DOMString value;
   };
 
   // <dl><dt>uniquify</dt>
@@ skipping 526 matching lines @@
     // <code>suggestion</code> object to <code>suggest</code> wins. In order to
     // avoid confusion regarding which extension will win, users should not
     // install extensions that may conflict. If the download is initiated by
     // $(ref:download) and the target filename is known before the MIME type and
     // tentative filename have been determined, pass <code>filename</code> to
     // $(ref:download) instead.
     [maxListeners=1] static void onDeterminingFilename(
         DownloadItem downloadItem, SuggestFilenameCallback suggest);
   };
 };