Use a direct include of strings headers in chrome/browser/chromeos/.

chrome/browser/chromeos/proxy_cros_settings_parser.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 "chrome/browser/chromeos/proxy_cros_settings_parser.h"
 
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
 #include "base/values.h"
 #include "chrome/browser/chromeos/ui_proxy_config.h"
 #include "chrome/browser/chromeos/ui_proxy_config_service.h"
 
 namespace chromeos {
 
 // Common prefix of all proxy prefs.
 const char kProxyPrefsPrefix[] = "cros.session.proxy";
 
 // Names of proxy preferences.
@@ skipping 353 matching lines @@
   } else {
     dict->SetBoolean("disabled", false);
   }
   *out_value = dict;
   return true;
 }
 
 }  // namespace proxy_cros_settings_parser
 
 }  // namespace chromeos