Revert of 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 8f4e0fc0d5b8cf1025764fab36b319404eb0a019..32f6a617b030d97968b6829a3b9b5cee05e95f13 100644
--- a/ui/views/window/dialog_client_view.h
+++ b/ui/views/window/dialog_client_view.h
@@ -93,6 +93,9 @@
   // Returns the insets for the buttons and extra view.
   gfx::Insets GetButtonRowInsets() const;
 
+  // Closes the widget.
+  void Close();
+
   // Sets up the focus chain for the child views. This is required since the
   // delegate may choose to add/remove views at any time.
   void SetupFocusChain();
@@ -108,10 +111,10 @@
   View* footnote_view_;
 
   // True if we've notified the delegate the window is closing and the delegate
-  // allowed the close. In some situations it's possible to get two closes (see
+  // 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 delegate_allowed_close_;
+  bool notified_delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(DialogClientView);
 };