Cleanup: Remove unneeded includes of pref_names.h

chrome/test/tab_switching/tab_switching_test.cc

 // Copyright (c) 2010 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 "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/scoped_ptr.h"
 #include "base/threading/platform_thread.h"
 #include "base/time.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/env_vars.h"
-#include "chrome/common/pref_names.h"
 #include "chrome/test/automation/tab_proxy.h"
 #include "chrome/test/automation/browser_proxy.h"
 #include "chrome/test/ui/ui_perf_test.h"
 #include "googleurl/src/gurl.h"
 #include "net/base/net_util.h"
 
 using base::TimeDelta;
 
 namespace {
 
@@ skipping 157 matching lines @@
 TEST_F(TabSwitchingUITest, TabSwitch) {
   RunTabSwitchingUITest("t", true);
 }
 
 TEST_F(TabSwitchingUITest, TabSwitchRef) {
   UseReferenceBuild();
   RunTabSwitchingUITest("t_ref", true);
 }
 
 }  // namespace