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

chrome/test/webdriver/commands/set_timeout_commands.cc

 // Copyright (c) 2011 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/commands/set_timeout_commands.h"
 
 #include <string>
 
-#include "base/stringprintf.h"
+#include "base/strings/stringprintf.h"
 #include "base/values.h"
 #include "chrome/test/webdriver/commands/response.h"
 #include "chrome/test/webdriver/webdriver_error.h"
 #include "chrome/test/webdriver/webdriver_session.h"
 
 namespace webdriver {
 
 SetTimeoutCommand::SetTimeoutCommand(
     const std::vector<std::string>& path_segments,
     const DictionaryValue* const parameters) :
@@ skipping 54 matching lines @@
     const DictionaryValue* const parameters)
     : SetTimeoutCommand(path_segments, parameters) {}
 
 ImplicitWaitCommand::~ImplicitWaitCommand() {}
 
 void ImplicitWaitCommand::SetTimeout(int timeout_ms) {
   session_->set_implicit_wait(timeout_ms);
 }
 
 }  // namespace webdriver