Use a direct include of strings headers in chrome/test/.

chrome/test/webdriver/webdriver_automation.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/test/webdriver/webdriver_automation.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/base_paths.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/json/json_writer.h"
 #include "base/memory/ref_counted.h"
 #include "base/path_service.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
+#include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/values.h"
 #include "chrome/common/automation_constants.h"
 #include "chrome/common/automation_messages.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/automation/automation_json_requests.h"
 #include "chrome/test/automation/automation_proxy.h"
@@ skipping 1174 matching lines @@
 }
 
 Error* Automation::CheckMaximizeSupported() {
   const char* message =
       "Maximize automation interface is not supported for this version of "
       "Chrome.";
   return CheckVersion(1160, message);
 }
 
 }  // namespace webdriver