Cleanup: IWYU for BrowserThread.

chrome/browser/ui/gtk/select_file_dialog_impl_kde.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 <set>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/nix/mime_util_xdg.h"
 #include "base/nix/xdg_util.h"
 #include "base/process_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_util.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/ui/gtk/select_file_dialog_impl.h"
 #include "content/public/browser/browser_thread.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 // These conflict with base/tracked_objects.h, so need to come last.
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 
@@ skipping 424 matching lines @@
       continue;
     filenames_fp.push_back(path);
   }
 
   if (filenames_fp.empty()) {
     FileNotSelected(params);
     return;
   }
   MultiFilesSelected(filenames_fp, params);
 }