Move last of event handlers down to NativeWidgetWin/Gtk.

views/widget/native_widget_delegate.h

Index: views/widget/native_widget_delegate.h
===================================================================
--- views/widget/native_widget_delegate.h	(revision 88529)
+++ views/widget/native_widget_delegate.h	(working copy)
@@ -24,6 +24,12 @@
  public:
   virtual ~NativeWidgetDelegate() {}
 
+  // Returns true if the window is modal.
+  virtual bool IsModal() const = 0;
+
+  // Returns true if the window is a dialog box.
+  virtual bool IsDialogBox() const = 0;
+
   // Returns true if the window can be activated.
   virtual bool CanActivate() const = 0;