[CleanUp] Use base::STLSetDifference in place of std::set_difference

chrome/browser/media_galleries/media_file_system_registry.cc

 // 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.
 
 // MediaFileSystemRegistry implementation.
 
 #include "chrome/browser/media_galleries/media_file_system_registry.h"
 
 #include <set>
 #include <vector>
@@ skipping 249 matching lines @@
   void RevokeOldGalleries(const MediaGalleryPrefIdSet& new_galleries) {
     if (new_galleries.size() == pref_id_map_.size())
       return;
 
     MediaGalleryPrefIdSet old_galleries;
     for (PrefIdFsInfoMap::const_iterator it = pref_id_map_.begin();
          it != pref_id_map_.end();
          ++it) {
       old_galleries.insert(it->first);
     }
-    MediaGalleryPrefIdSet invalid_galleries;
-    std::set_difference(old_galleries.begin(), old_galleries.end(),
-                        new_galleries.begin(), new_galleries.end(),
-                        std::inserter(invalid_galleries,
-                                      invalid_galleries.begin()));
+    MediaGalleryPrefIdSet invalid_galleries =
+        base::STLSetDifference<MediaGalleryPrefIdSet>(old_galleries,
+                                                      new_galleries);
     for (MediaGalleryPrefIdSet::const_iterator it = invalid_galleries.begin();
          it != invalid_galleries.end();
          ++it) {
       RevokeGalleryByPrefId(*it);
     }
   }
 
   // Revoke the file system for |id| if this extension has created one for |id|.
   void RevokeGalleryByPrefId(MediaGalleryPrefId id) {
     PrefIdFsInfoMap::iterator gallery = pref_id_map_.find(id);
@@ skipping 454 matching lines @@
     // previously used.
     PrefChangeRegistrarMap::iterator pref_it =
         pref_change_registrar_map_.find(profile);
     DCHECK(pref_it != pref_change_registrar_map_.end());
     delete pref_it->second;
     pref_change_registrar_map_.erase(pref_it);
   }
 }
 
 }  // namespace chrome