Change ui::Event::time_stamp from TimeDelta to TimeTicks

ui/views/controls/menu/menu_controller.h

Index: ui/views/controls/menu/menu_controller.h
diff --git a/ui/views/controls/menu/menu_controller.h b/ui/views/controls/menu/menu_controller.h
index 20c1bee5d2fc082c8e8e282c4e3f77f4f4d8bb2f..bf97e15ebbeeb3ad37a244ffd078e929af8ff1e2 100644
--- a/ui/views/controls/menu/menu_controller.h
+++ b/ui/views/controls/menu/menu_controller.h
@@ -132,6 +132,7 @@ class VIEWS_EXPORT MenuController : public WidgetObserver {
   ExitType exit_type() const { return exit_type_; }
 
   // Returns the time from the event which closed the menu - or 0.
+  // TODO(majidvp): Should return a TimeTicks. crbug.com/453559
   base::TimeDelta closing_event_time() const { return closing_event_time_; }
 
   void set_is_combobox(bool is_combobox) { is_combobox_ = is_combobox; }