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

chrome/test/chromedriver/server/http_response.cc

 // Copyright (c) 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/test/chromedriver/server/http_response.h"
 
 #include "base/format_macros.h"
-#include "base/string_util.h"
-#include "base/stringprintf.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 
 const int HttpResponse::kOk = 200;
 const int HttpResponse::kNoContent = 204;
 const int HttpResponse::kSeeOther = 303;
 const int HttpResponse::kNotModified = 304;
 const int HttpResponse::kBadRequest = 400;
 const int HttpResponse::kForbidden = 403;
 const int HttpResponse::kNotFound = 404;
 const int HttpResponse::kMethodNotAllowed = 405;
 const int HttpResponse::kInternalServerError = 500;
@@ skipping 125 matching lines @@
 
 void HttpResponse::set_body(const std::string& body) {
   body_ = body;
 }
 
 void HttpResponse::UpdateHeader(const std::string& name,
                                 const std::string& new_value) {
   RemoveHeader(name);
   AddHeader(name, new_value);
 }