Fixed media gallery IDL typo.

chrome/common/extensions/api/media_galleries.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.mediaGalleries</code> API to access media files (audio,
 // images, video) from the user's local disks (with the user's consent).
 namespace mediaGalleries {
 
   [inline_doc] enum GalleryChangeType {
     // The contents of the gallery have changed.
@@ skipping 150 matching lines @@
     DOMString? language;
     DOMString? title;
     long? track;
 
     // All the metadata in the media file. For formats with multiple streams,
     // stream order will be preserved. Container metadata is the first element.
     StreamInfo[] rawTags;
 
     // The images embedded in the media file's metadata. This is most often
     // used for album art or video thumbnails.
-    [instanceof=Blob] object[] attachedImages;
+    [instanceOf=Blob] object[] attachedImages;
   };
 
   callback MediaMetadataCallback = void (MediaMetadata metadata);
 
   interface Functions {
     // Get the media galleries configured in this user agent. If none are
     // configured or available, the callback will receive an empty array.
     static void getMediaFileSystems(optional MediaFileSystemsDetails details,
                                     MediaFileSystemsCallback callback);
 
@@ skipping 42 matching lines @@
 
   interface Events {
     // Fired when a media gallery is changed or a gallery watch is dropped.
     static void onGalleryChanged(GalleryChangeDetails details);
 
     // The pending media scan has changed state. See details for more
     // information.
     static void onScanProgress(ScanProgressDetails details);
   };
 };