MacViews: Implement CloseNow() as just -[NSWindow close].

ui/views/widget/native_widget_mac.h

Index: ui/views/widget/native_widget_mac.h
diff --git a/ui/views/widget/native_widget_mac.h b/ui/views/widget/native_widget_mac.h
index 59867c02b5435ce425dba2d8c6031f52aa645e11..ca5b40306e4f47172d047d0a15b10a60a9d71326 100644
--- a/ui/views/widget/native_widget_mac.h
+++ b/ui/views/widget/native_widget_mac.h
@@ -39,7 +39,7 @@ class VIEWS_EXPORT NativeWidgetMac : public internal::NativeWidgetPrivate {
 
   // Deletes |bridge_| and informs |delegate_| that the native widget is
   // destroyed. This is usually called from the NSWindowDelegate.

[karandeepb, 2016/10/18 10:00:29]

nit: Maybe change the comment to- "This is usually called from the |bridge_|
when the window delegate receives windowWillClose: message" or something
similar.

[tapted, 2016/10/19 06:20:25]

Done. (the sheetDidEnd: delegate method invokes this too, but also via
BridgedNativeWidget::OnWindowWillClose)

-  void OnWindowWillClose();
+  void OnWindowDestroyed();
 
   // Returns the vertical position that sheets should be anchored, in pixels
   // from the bottom of the window.