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

chrome/test/webdriver/webdriver_logging.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_logging.h"
 
 #include <cmath>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
 #include "base/strings/string_number_conversions.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/time.h"
 #include "build/build_config.h"
 
 using base::DictionaryValue;
 using base::ListValue;
 using base::Value;
 
 namespace webdriver {
 
 FileLog* FileLog::singleton_ = NULL;
@@ skipping 223 matching lines @@
     log = FileLog::CreateFileLog(FILE_PATH_LITERAL("chromedriver.log"),
                                  min_log_level);
   } else {
     log = new FileLog(log_path, min_log_level);
   }
   FileLog::SetGlobalLog(log);
   return log->IsOpen();
 }
 
 }  // namespace webdriver