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

chrome/browser/media_galleries/media_file_system_registry.cc

Index: chrome/browser/media_galleries/media_file_system_registry.cc
diff --git a/chrome/browser/media_galleries/media_file_system_registry.cc b/chrome/browser/media_galleries/media_file_system_registry.cc
index 232f89b32bad12c548a9c4f7f05e5f22cb7e090f..08a103b02afae15abe9c2f880c6446932b17e853 100644
--- a/chrome/browser/media_galleries/media_file_system_registry.cc
+++ b/chrome/browser/media_galleries/media_file_system_registry.cc
@@ -243,11 +243,9 @@ class ExtensionGalleriesHost
          ++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) {