Dont retry sync in case of auth errors.

chrome/browser/sync/engine/syncapi.cc

Index: chrome/browser/sync/engine/syncapi.cc
diff --git a/chrome/browser/sync/engine/syncapi.cc b/chrome/browser/sync/engine/syncapi.cc
index 229d3429318292478f51366840d7e527b4e0e875..4009cbe84f13ca63afa4e0623a1ef1b33ed9fd76 100644
--- a/chrome/browser/sync/engine/syncapi.cc
+++ b/chrome/browser/sync/engine/syncapi.cc
@@ -1945,11 +1945,12 @@ void SyncManager::SyncInternal::UpdateCredentials(
   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();
+    }
   }
 }