[Extensions] Convert APIs to use movable types [7]

chrome/common/extensions/api/media_galleries.idl

Index: chrome/common/extensions/api/media_galleries.idl
diff --git a/chrome/common/extensions/api/media_galleries.idl b/chrome/common/extensions/api/media_galleries.idl
index 4c21ef75971a7deb7df4b4ae256a97926dad8d23..b3024bf38511801d547d368af46c6c92c0835c37 100644
--- a/chrome/common/extensions/api/media_galleries.idl
+++ b/chrome/common/extensions/api/media_galleries.idl
@@ -2,9 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+
 // Use the <code>chrome.mediaGalleries</code> API to access media files (audio,
 // images, video) from the user's local disks (with the user's consent).
-namespace mediaGalleries {
+[use_movable_types=true] namespace mediaGalleries {
 
   [inline_doc] enum GalleryChangeType {
     // The contents of the gallery have changed.