Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/first_run/first_run.cc

Index: chrome/browser/first_run/first_run.cc
diff --git a/chrome/browser/first_run/first_run.cc b/chrome/browser/first_run/first_run.cc
index 6b9e6506e5e9178d7156fde507bdf4727dced00e..4eebbfa8c00f123eaf10446f0d624a436ee1d4f6 100644
--- a/chrome/browser/first_run/first_run.cc
+++ b/chrome/browser/first_run/first_run.cc
@@ -388,10 +388,7 @@ void FirstRunBubbleLauncher::Observe(
           Profile::FromBrowserContext(contents->GetBrowserContext());
       SigninManagerBase* manager =
           SigninManagerFactory::GetForProfile(profile);
-      bool signin_in_progress = manager &&
-          (!manager->GetAuthenticatedUsername().empty() &&
-              SigninTracker::GetSigninState(profile, NULL) !=
-                  SigninTracker::SIGNIN_COMPLETE);
+      bool signin_in_progress = manager && manager->AuthInProgress();
       bool is_promo_bubble_visible =
           profile->GetPrefs()->GetBoolean(prefs::kSignInPromoShowNTPBubble);