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

chrome/test/webdriver/webdriver_capabilities_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/test/webdriver/webdriver_capabilities_parser.h"
 
 #include "base/file_util.h"
 #include "base/format_macros.h"
-#include "base/stringprintf.h"
-#include "base/string_util.h"
+#include "base/strings/string_util.h"
+#include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_logging.h"
 #include "chrome/test/webdriver/webdriver_util.h"
 
 using base::DictionaryValue;
 using base::Value;
 
 namespace webdriver {
@@ skipping 423 matching lines @@
     if (!switches->GetString(i, &switch_name)) {
       return new Error(kBadRequest,
                        "Each switch to be removed must be a string");
     }
     caps_->exclude_switches.insert(switch_name);
   }
   return NULL;
 }
 
 }  // namespace webdriver