Do not activate system tray bubble by default

ash/common/system/date/date_default_view.h

Index: ash/common/system/date/date_default_view.h
diff --git a/ash/common/system/date/date_default_view.h b/ash/common/system/date/date_default_view.h
index 004165e009cba53eba55deeb64c812f6edd46633..32ad489324e7175b0d656c8734d285493929e77f 100644
--- a/ash/common/system/date/date_default_view.h
+++ b/ash/common/system/date/date_default_view.h
@@ -18,6 +18,7 @@ namespace tray {
 class DateView;
 }  // namespace tray
 
+class SystemTrayItem;
 class TrayPopupHeaderButton;
 
 // The system tray bubble view with the date and buttons for help, lock and
@@ -26,7 +27,7 @@ class ASH_EXPORT DateDefaultView : public views::View,
                                    public views::ButtonListener,
                                    public ShutdownPolicyObserver {
  public:
-  explicit DateDefaultView(LoginStatus login);
+  DateDefaultView(SystemTrayItem* owner, LoginStatus login);
 
   ~DateDefaultView() override;