Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/signin/signin_manager.cc

Index: chrome/browser/signin/signin_manager.cc
diff --git a/chrome/browser/signin/signin_manager.cc b/chrome/browser/signin/signin_manager.cc
index 119e68097cbaf4a05b51acf74fe1b74505d5ca5d..b71be71ac4d9b62cecac2f76697a1d4b58ce70cb 100644
--- a/chrome/browser/signin/signin_manager.cc
+++ b/chrome/browser/signin/signin_manager.cc
@@ -593,8 +593,12 @@ void SigninManager::CompletePendingSignin() {
   token_service->StartFetchingTokens();
 
   // If we have oauth2 tokens, tell token service about them so it does not
-  // need to fetch them again.
+  // need to fetch them again.  Its important that the authenticated name has
+  // already been set before sending the oauth2 token to the token service.
+  // Some token service listeners will query the authenticated name when they
+  // receive the token available notification.
   if (!temp_oauth_login_tokens_.refresh_token.empty()) {
+    DCHECK(!GetAuthenticatedUsername().empty());
     token_service->UpdateCredentialsWithOAuth2(temp_oauth_login_tokens_);
     temp_oauth_login_tokens_ = ClientOAuthResult();
   }