Add local file system directory listings support for content shell.

content/shell/shell_gtk.cc

 // Copyright (c) 2012 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 "content/shell/shell.h"
 
 #include <gdk/gdkkeysyms.h>
 #include <gtk/gtk.h>
 
 #include "base/command_line.h"
@@ skipping 42 matching lines @@
   AddMenuEntry(debug_menu, "Show web inspector...",
                G_CALLBACK(ShowWebInspectorActivated), shell);
   return menu_bar;
 }
 
 }  // namespace
 
 void Shell::PlatformInitialize() {
 }
 
-base::StringPiece Shell::PlatformResourceProvider(int key) {
-  NOTIMPLEMENTED();
-  return base::StringPiece();
-}
-
 void Shell::PlatformCleanUp() {
   // Nothing to clean up; GTK will clean up the widgets shortly after.
 }
 
 void Shell::PlatformEnableUIControl(UIControl control, bool is_enabled) {
   GtkToolItem* item = NULL;
   switch (control) {
     case BACK_BUTTON:
       item = back_button_;
       break;
@@ skipping 214 matching lines @@
   gtk_widget_grab_focus(GTK_WIDGET(url_edit_view_));
   return TRUE;
 }
 
 void Shell::PlatformSetTitle(const string16& title) {
   std::string title_utf8 = UTF16ToUTF8(title);
   gtk_window_set_title(GTK_WINDOW(window_), title_utf8.c_str());
 }
 
 }  // namespace content