For Mac, add AppListViewDelegateObserver::OnShutdown

chrome/browser/ui/app_list/app_list_view_delegate.cc

Index: chrome/browser/ui/app_list/app_list_view_delegate.cc
diff --git a/chrome/browser/ui/app_list/app_list_view_delegate.cc b/chrome/browser/ui/app_list/app_list_view_delegate.cc
index af012b2907019a935f8a740d7c3db45874cb71fb..ab45f723469f82ae5d7ff684a9e6b21cbfd06725 100644
--- a/chrome/browser/ui/app_list/app_list_view_delegate.cc
+++ b/chrome/browser/ui/app_list/app_list_view_delegate.cc
@@ -646,6 +646,9 @@ void AppListViewDelegate::Observe(int type,
                                   const content::NotificationDetails& details) {
   switch (type) {
     case chrome::NOTIFICATION_APP_TERMINATING:
+      FOR_EACH_OBSERVER(
+          app_list::AppListViewDelegateObserver, observers_, OnShutdown());
+
       SetProfile(NULL);  // Ensures launcher page web contents are torn down.
 
       // SigninManagerFactory is not a leaky singleton (unlike this class), and