Compile fix for gcc 4.6 (WebDataService::Handle is typedef of int).

TBR=timsteele@chromium.org
BUG=none


Review URL: http://codereview.chromium.org/8919015

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@114211 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/sync/profile_sync_service_autofill_unittest.cc

@@ -194,7 +194,7 @@ class WebDataServiceFake : public WebDataService {
     // initialization (which seems way more fragile) we can't tell which
     // component is asking at what time, and some components in these Autofill
     // tests require a WebDataService.
-    return NULL;
+    return 0;
   }
 
   virtual AutocompleteSyncableService*