Hide hover effect on hidden ink drop host views.

ui/views/controls/button/menu_button.cc

Index: ui/views/controls/button/menu_button.cc
diff --git a/ui/views/controls/button/menu_button.cc b/ui/views/controls/button/menu_button.cc
index 3602b45bc9cfbe483d28189ef9b6c93d3f8aed56..7d411ce05ee2ce283044804075cb50697b40408e 100644
--- a/ui/views/controls/button/menu_button.cc
+++ b/ui/views/controls/button/menu_button.cc
@@ -400,7 +400,8 @@ void MenuButton::DecrementPressedLocked() {
       desired_state = STATE_HOVERED;
     }
     SetState(desired_state);
-    if (ink_drop_delegate() && state() != STATE_PRESSED)
+    // The widget may be null during shutdown.

[bruthig, 2016/06/03 22:35:25]

nit: Can you beef up this comment a little.  It is unclear to me why the call to
OnAction() requires a Widget...

[Evan Stade, 2016/06/03 22:42:40]

Done. Creating an ink drop requires a native theme which we won't have during
shutdown.

+    if (GetWidget() && ink_drop_delegate() && state() != STATE_PRESSED)
       ink_drop_delegate()->OnAction(InkDropState::DEACTIVATED);
   }
 }