Get rid of BookmarkEditor::Show()'s BookmarkEditor::Handler argument.

chrome/browser/gtk/bookmark_bubble_gtk.cc

 // Copyright (c) 2009 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.
 
 #include "chrome/browser/gtk/bookmark_bubble_gtk.h"
 
 #include <gtk/gtk.h>
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
@@ skipping 371 matching lines @@
   // Closing might delete us, so we'll cache what we need on the stack.
   Profile* profile = profile_;
   GtkWindow* toplevel = GTK_WINDOW(gtk_widget_get_toplevel(anchor_));
 
   // Close the bubble, deleting the C++ objects, etc.
   bubble_->Close();
 
   if (node) {
     BookmarkEditor::Show(toplevel, profile, NULL,
                          BookmarkEditor::EditDetails(node),
-                         BookmarkEditor::SHOW_TREE, NULL);
+                         BookmarkEditor::SHOW_TREE);
   }
 }