Add an OVERRIDE to webkit/.

BUG=104314
TEST=no change

Review URL: http://codereview.chromium.org/8590007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@110497 0039d316-1c4b-4281-b951-d872f2087c98

webkit/appcache/appcache_test_helper.h

@@ -31,7 +31,7 @@ class AppCacheTestHelper : public appcache::AppCacheStorage::Delegate {
       appcache::AppCacheGroup* group,
       appcache::AppCache* newest_cache,
       bool success,
-      bool would_exceed_quota);
+      bool would_exceed_quota) OVERRIDE;
   void OnGotAppCacheInfo(int rv);
 
   int group_id_;