Introduce ability to register callback with GoogleURLTracker

chrome/browser/google/google_url_tracker.cc

Index: chrome/browser/google/google_url_tracker.cc
diff --git a/chrome/browser/google/google_url_tracker.cc b/chrome/browser/google/google_url_tracker.cc
index 535cbbaa8ecac4a3a3c9bec030592abe7f3d8783..b6a69f1dd85a9a94540ea6ca64c86fde535708b6 100644
--- a/chrome/browser/google/google_url_tracker.cc
+++ b/chrome/browser/google/google_url_tracker.cc
@@ -107,6 +107,10 @@ void GoogleURLTracker::AcceptGoogleURL(bool redo_searches) {
   PrefService* prefs = profile_->GetPrefs();
   prefs->SetString(prefs::kLastKnownGoogleURL, google_url_.spec());
   prefs->SetString(prefs::kLastPromptedGoogleURL, google_url_.spec());
+  NotifyGoogleURLUpdated(urls.first, urls.second);
+
+  // TODO(blundell): Convert all clients to use the callback interface and
+  // eliminate this notification. crbug.com/373237
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_GOOGLE_URL_UPDATED,
       content::Source<Profile>(profile_),