Remove DialogDelegate::OnClosed() which is redundant with

ui/views/window/dialog_client_view.h

Index: ui/views/window/dialog_client_view.h
diff --git a/ui/views/window/dialog_client_view.h b/ui/views/window/dialog_client_view.h
index 1108904f5d519fd81f1e01b398fe39f990138a55..2fe4744f1aaefa4754ebb86594527e126b52c8d8 100644
--- a/ui/views/window/dialog_client_view.h
+++ b/ui/views/window/dialog_client_view.h
@@ -106,12 +106,6 @@ class VIEWS_EXPORT DialogClientView : public ClientView,
   // The footnote view shown below the buttons; may be NULL.
   View* footnote_view_;
 
-  // True if we've notified the delegate the window is closing and the delegate
-  // allosed the close. In some situations it's possible to get two closes (see
-  // http://crbug.com/71940). This is used to avoid notifying the delegate
-  // twice, which can have bad consequences.
-  bool notified_delegate_;

[sky, 2016/02/11 22:56:56]

Why is this no longer necessary?

-
   DISALLOW_COPY_AND_ASSIGN(DialogClientView);
 };