Minor fixes for WidgetRemovalsObserver::OnWillRemoveView

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index 9ee7272bd04f4fbaa7078350e6eeb8462b484462..95f5c7037ab53e13e4915852e1b618547a1fc345 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -1798,11 +1798,14 @@ void View::DoRemoveChildView(View* view,
         next_focusable->previous_focusable_view_ = prev_focusable;
     }
 
-    if (GetWidget()) {
+    Widget* widget = GetWidget();
+    if (widget) {
       UnregisterChildrenForVisibleBoundsNotification(view);
       if (view->visible())
         view->SchedulePaint();
-      GetWidget()->NotifyWillRemoveView(view);
+
+      if (!new_parent || new_parent->GetWidget() != widget)
+        widget->NotifyWillRemoveView(view);
     }
 
     view->PropagateRemoveNotifications(this, new_parent);