Use a direct include of strings headers in ui/, part 2.

ui/shell_dialogs/gtk/select_file_dialog_impl_gtk.cc

 // Copyright (c) 2013 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 <gtk/gtk.h>
 #include <map>
 #include <set>
 #include <vector>
 
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/strings/sys_string_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "grit/ui_strings.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/shell_dialogs/gtk/select_file_dialog_impl.h"
 #include "ui/shell_dialogs/select_file_dialog.h"
 
@@ skipping 547 matching lines @@
 }  // namespace
 
 namespace ui {
 
 SelectFileDialogImpl* SelectFileDialogImpl::NewSelectFileDialogImplGTK(
     Listener* listener, ui::SelectFilePolicy* policy) {
   return new SelectFileDialogImplGTK(listener, policy);
 }
 
 }  // namespace ui