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

chrome/installer/util/user_experiment.cc

 // Copyright 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 "chrome/installer/util/user_experiment.h"
 
 #include <windows.h>
 #include <sddl.h>
 #include <wtsapi32.h>
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/process_util.h"
 #include "base/rand_util.h"
-#include "base/string_util.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/win/scoped_handle.h"
 #include "base/win/windows_version.h"
 #include "chrome/common/attrition_experiments.h"
 #include "chrome/common/chrome_result_codes.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/installer/util/browser_distribution.h"
 #include "chrome/installer/util/google_update_constants.h"
 #include "chrome/installer/util/google_update_settings.h"
 #include "chrome/installer/util/helper.h"
@@ skipping 500 matching lines @@
   // running.
   bool system_level_toast = CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kSystemLevelToast);
 
   CommandLine cmd(InstallUtil::GetChromeUninstallCmd(
                       system_level_toast, product.distribution()->GetType()));
   base::LaunchProcess(cmd, base::LaunchOptions(), NULL);
 }
 
 }  // namespace installer