Remove wstring from RVH's run Javascript command....

chrome/browser/dom_ui/dom_ui_handler_browsertest.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/browser/dom_ui/dom_ui_handler_browsertest.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/test/ui_test_utils.h"
 
 bool DOMUITestHandler::Execute(const std::string& js_test) {
   dom_ui_->GetRenderViewHost()->ExecuteJavascriptInWebFrame(
-      std::wstring(), UTF8ToWide(js_test));
+      string16(), UTF8ToUTF16(js_test));
   return WaitForResult();
 }
 
 void DOMUITestHandler::HandlePass(const ListValue* args) {
   test_succeeded_ = true;
   if (is_waiting_)
     MessageLoopForUI::current()->Quit();
 }
 
 void DOMUITestHandler::HandleFail(const ListValue* args) {
   test_succeeded_ = false;
   if (is_waiting_)
     MessageLoopForUI::current()->Quit();
 }
 
 void DOMUITestHandler::RegisterMessages() {
   dom_ui_->RegisterMessageCallback("Pass",
       NewCallback(this, &DOMUITestHandler::HandlePass));
   dom_ui_->RegisterMessageCallback("Fail",
       NewCallback(this, &DOMUITestHandler::HandleFail));
 }
 
 bool DOMUITestHandler::WaitForResult() {
   is_waiting_ = true;
   ui_test_utils::RunMessageLoop();
   is_waiting_ = false;
   return test_succeeded_;
 }