Fix a crash in incognito mode when clicking the wrench menu.

chrome/browser/sync/sync_status_ui_helper.cc

Index: chrome/browser/sync/sync_status_ui_helper.cc
diff --git a/chrome/browser/sync/sync_status_ui_helper.cc b/chrome/browser/sync/sync_status_ui_helper.cc
index 2c221cba3d1a05c8715148b19f3f31bba698507b..b642d3cb335df0af27019b0c8702e8dcc89cf210 100644
--- a/chrome/browser/sync/sync_status_ui_helper.cc
+++ b/chrome/browser/sync/sync_status_ui_helper.cc
@@ -63,6 +63,10 @@ SyncStatusUIHelper::MessageType SyncStatusUIHelper::GetLabels(
     std::wstring* link_label) {
   MessageType result_type(SYNCED);
 
+  if (!service) {
+    return PRE_SYNCED;
+  }
+
   if (service->HasSyncSetupCompleted()) {
     ProfileSyncService::Status status(service->QueryDetailedSyncStatus());
     AuthErrorState auth_error(service->GetAuthErrorState());