Implement local storage for App List in case app sync is off.

chrome/browser/ui/ash/chrome_launcher_prefs.cc

Index: chrome/browser/ui/ash/chrome_launcher_prefs.cc
diff --git a/chrome/browser/ui/ash/chrome_launcher_prefs.cc b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
index c57d1cd8a3d2c802bf3961c257972b8f822fc6ab..a7cbfb15a355d2b28f21110083420a2938278b0a 100644
--- a/chrome/browser/ui/ash/chrome_launcher_prefs.cc
+++ b/chrome/browser/ui/ash/chrome_launcher_prefs.cc
@@ -598,8 +598,8 @@ std::vector<AppLauncherId> GetPinnedAppsFromPrefs(
     LauncherControllerHelper* helper) {
   app_list::AppListSyncableService* app_service =
       app_list::AppListSyncableServiceFactory::GetForProfile(helper->profile());
-  // Some unit tests may not have it.
-  if (!app_service)
+  // Some unit tests may not have it or service may not be initialized.
+  if (!app_service || !app_service->IsInitialized())
     return std::vector<AppLauncherId>();
 
   std::vector<PinInfo> pin_infos;