Use current gtk dialogs in linux_aura.

chrome/browser/ui/libgtk2ui/gtk2_signal.h

Index: chrome/browser/ui/libgtk2ui/gtk2_signal.h
diff --git a/ui/base/gtk/gtk_signal.h b/chrome/browser/ui/libgtk2ui/gtk2_signal.h
similarity index 95%
copy from ui/base/gtk/gtk_signal.h
copy to chrome/browser/ui/libgtk2ui/gtk2_signal.h
index ca6fa2308d08e4d59e781ceb90561acf15d22e3b..42249e6674ce8fb703d0fccb0b42686adbb4f7dd 100644
--- a/ui/base/gtk/gtk_signal.h
+++ b/chrome/browser/ui/libgtk2ui/gtk2_signal.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_BASE_GTK_GTK_SIGNAL_H_
-#define UI_BASE_GTK_GTK_SIGNAL_H_
+#ifndef CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_H_
+#define CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_H_
 
 #include "ui/base/glib/glib_signal.h"
 
@@ -65,4 +65,4 @@ typedef struct _GtkWidget GtkWidget;
   CHROMEG_VIRTUAL_CALLBACK_6(CLASS, RETURN, METHOD, GtkWidget*, ARG1, ARG2,   \
                              ARG3, ARG4, ARG5, ARG6);
 
-#endif  // UI_BASE_GTK_GTK_SIGNAL_H_
+#endif  // CHROME_BROWSER_UI_LIBGTK2UI_GTK2_SIGNAL_H_