gtk: Make use of the gtk signal macro in HtmlDialogGtk class.

chrome/browser/gtk/html_dialog_gtk.h

Index: chrome/browser/gtk/html_dialog_gtk.h
diff --git a/chrome/browser/gtk/html_dialog_gtk.h b/chrome/browser/gtk/html_dialog_gtk.h
index 250f1a03806577c8b68bdfab9912a30855123878..a7b9e139d59d3b55fc73af892c59488821616745 100644
--- a/chrome/browser/gtk/html_dialog_gtk.h
+++ b/chrome/browser/gtk/html_dialog_gtk.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -8,6 +8,7 @@
 #include <string>
 #include <vector>
 
+#include "app/gtk_signal.h"
 #include "base/scoped_ptr.h"
 #include "chrome/browser/dom_ui/html_dialog_ui.h"
 #include "chrome/browser/dom_ui/html_dialog_tab_contents_delegate.h"
@@ -51,8 +52,7 @@ class HtmlDialogGtk : public HtmlDialogTabContentsDelegate,
   virtual void HandleKeyboardEvent(const NativeWebKeyboardEvent& event);
 
  private:
-  static void OnResponse(GtkWidget* widget, int response,
-                         HtmlDialogGtk* dialog);
+  CHROMEGTK_CALLBACK_1(HtmlDialogGtk, void, OnResponse, int);
 
   // This view is a delegate to the HTML content since it needs to get notified
   // about when the dialog is closing. For all other actions (besides dialog