Dont retry sync in case of auth errors.

chrome/browser/sync/engine/syncapi.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/sync/engine/syncapi.h"
 
 #include <algorithm>
 #include <bitset>
 #include <iomanip>
 #include <list>
@@ skipping 1927 matching lines @@
 }
 
 void SyncManager::SyncInternal::UpdateCredentials(
     const SyncCredentials& credentials) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK_EQ(credentials.email, share_.name);
   DCHECK(!credentials.email.empty());
   DCHECK(!credentials.sync_token.empty());
 
   observing_ip_address_changes_ = true;
-  connection_manager()->set_auth_token(credentials.sync_token);
-  sync_notifier_->UpdateCredentials(
-      credentials.email, credentials.sync_token);
-  if (!setup_for_test_mode_) {
-    CheckServerReachable();
+  if (connection_manager()->set_auth_token(credentials.sync_token)) {
+    sync_notifier_->UpdateCredentials(
+        credentials.email, credentials.sync_token);
+    if (!setup_for_test_mode_) {
+      CheckServerReachable();
+    }
   }
 }
 
 void SyncManager::SyncInternal::UpdateEnabledTypes() {
   DCHECK(thread_checker_.CalledOnValidThread());
   ModelSafeRoutingInfo routes;
   registrar_->GetModelSafeRoutingInfo(&routes);
   syncable::ModelTypeSet enabled_types;
   for (ModelSafeRoutingInfo::const_iterator it = routes.begin();
        it != routes.end(); ++it) {
@@ skipping 1047 matching lines @@
 void SyncManager::TriggerOnIncomingNotificationForTest(
     const syncable::ModelTypeBitSet& model_types) {
   syncable::ModelTypePayloadMap model_types_with_payloads =
       syncable::ModelTypePayloadMapFromBitSet(model_types,
           std::string());
 
   data_->OnIncomingNotification(model_types_with_payloads);
 }
 
 }  // namespace sync_api