GTK: More transitions to thunk definition macros.

chrome/browser/gtk/external_protocol_dialog_gtk.h

Index: chrome/browser/gtk/external_protocol_dialog_gtk.h
diff --git a/chrome/browser/gtk/external_protocol_dialog_gtk.h b/chrome/browser/gtk/external_protocol_dialog_gtk.h
index 748739a7abe44e006595933eb5c6f8c9cd05b3eb..c77b2843ff000c50ff3b194f4746774b92d746ac 100644
--- a/chrome/browser/gtk/external_protocol_dialog_gtk.h
+++ b/chrome/browser/gtk/external_protocol_dialog_gtk.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_GTK_EXTERNAL_PROTOCOL_DIALOG_GTK_H_
 #define CHROME_BROWSER_GTK_EXTERNAL_PROTOCOL_DIALOG_GTK_H_
 
+#include "app/gtk_signal.h"
 #include "base/time.h"
 #include "googleurl/src/gurl.h"
 
@@ -17,12 +18,7 @@ class ExternalProtocolDialogGtk {
   explicit ExternalProtocolDialogGtk(const GURL& url);
 
  private:
-  static void OnDialogResponseThunk(GtkWidget* widget,
-                                    int response,
-                                    ExternalProtocolDialogGtk* dialog) {
-    dialog->OnDialogResponse(response);
-  }
-  void OnDialogResponse(int response);
+  CHROMEGTK_CALLBACK_1(ExternalProtocolDialogGtk, void, OnDialogResponse, int);
 
   GtkWidget* dialog_;
   GtkWidget* checkbox_;