Convert SigninTracker to use OAuth2TokenService notifications

chrome/browser/signin/token_service.cc

Index: chrome/browser/signin/token_service.cc
diff --git a/chrome/browser/signin/token_service.cc b/chrome/browser/signin/token_service.cc
index 2367348cc12dea946a83fe3e1f687bba289975f6..f402316d0c21edf60f54c172e13155e2217000d8 100644
--- a/chrome/browser/signin/token_service.cc
+++ b/chrome/browser/signin/token_service.cc
@@ -158,6 +158,21 @@ void TokenService::UpdateCredentialsWithOAuth2(
   SaveOAuth2Credentials(oauth2_tokens);
 }
 
+void TokenService::ClearOAuth2Credentials() {
+  token_map_.erase(GaiaConstants::kGaiaOAuth2LoginRefreshToken);
+  if (token_web_data_.get()) {
+    token_web_data_->RemoveTokenForService(
+        GaiaConstants::kGaiaOAuth2LoginRefreshToken);
+  }
+
+  FOR_DIAGNOSTICS_OBSERVERS(
+      NotifyClearStoredToken(GaiaConstants::kGaiaOAuth2LoginRefreshToken));
+
+  FireTokenRequestFailedNotification(
+      GaiaConstants::kGaiaOAuth2LoginRefreshToken,
+      GoogleServiceAuthError(GoogleServiceAuthError::INVALID_GAIA_CREDENTIALS));
+}
+
 void TokenService::LoadTokensFromDB() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   if (token_web_data_.get())