gtk: Rename OnDialogResponse() to OnResponse() to standardize on a consistent naming scheme.

chrome/browser/ui/gtk/process_singleton_dialog.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_GTK_PROCESS_SINGLETON_DIALOG_H_
 #define CHROME_BROWSER_UI_GTK_PROCESS_SINGLETON_DIALOG_H_
 #pragma once
 
 #include <string>
 
-#include <gtk/gtk.h>
+#include "base/basictypes.h"
+#include "ui/base/gtk/gtk_signal.h"
 
-#include "base/basictypes.h"
+typedef struct _GtkWidget GtkWidget;
 
 // Displays an error to the user when the ProcessSingleton cannot acquire the
 // lock.  This runs the message loop itself as the browser message loop has not
 // started by that point in the startup process.
 class ProcessSingletonDialog {
  public:
   // Shows the dialog, and returns once the dialog has been closed.
   static void ShowAndRun(const std::string& message);
 
  private:
   explicit ProcessSingletonDialog(const std::string& message);
 
-  static void OnResponse(GtkWidget* widget,
-                         int response,
-                         ProcessSingletonDialog* dialog);
+  CHROMEGTK_CALLBACK_1(ProcessSingletonDialog, void, OnResponse, int);
 
   GtkWidget* dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessSingletonDialog);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_PROCESS_SINGLETON_DIALOG_H_