Use a direct include of strings headers in chrome/browser/ui/b*-p*/.

chrome/browser/ui/libgtk2ui/select_file_dialog_impl_gtk2.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 <gdk/gdk.h>
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 #include <map>
 #include <set>
 #include <vector>
 
 // Xlib defines RootWindow
 #undef RootWindow
 
 #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 "chrome/browser/ui/libgtk2ui/gtk2_signal.h"
 #include "chrome/browser/ui/libgtk2ui/select_file_dialog_impl.h"
 #include "grit/ui_strings.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window_observer.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 578 matching lines @@
   g_free(filename);
   if (pixbuf) {
     gtk_image_set_from_pixbuf(GTK_IMAGE(preview_), pixbuf);
     g_object_unref(pixbuf);
   }
   gtk_file_chooser_set_preview_widget_active(GTK_FILE_CHOOSER(chooser),
                                              pixbuf ? TRUE : FALSE);
 }
 
 }  // namespace libgtk2ui