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

chrome/browser/extensions/alert_apitest.cc

 // Copyright (c) 2010 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 "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_host.h"
 #include "chrome/browser/extensions/extension_process_manager.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/app_modal_dialogs/app_modal_dialog.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/test/ui_test_utils.h"
 
 IN_PROC_BROWSER_TEST_F(ExtensionApiTest, AlertBasic) {
   ASSERT_TRUE(RunExtensionTest("alert")) << message_;
 
   const Extension* extension = GetSingleLoadedExtension();
   ExtensionHost* host = browser()->profile()->GetExtensionProcessManager()->
       GetBackgroundHostForExtension(extension);
   ASSERT_TRUE(host);
-  host->render_view_host()->ExecuteJavascriptInWebFrame(L"",
-      L"alert('This should not crash.');");
+  host->render_view_host()->ExecuteJavascriptInWebFrame(string16(),
+      ASCIIToUTF16("alert('This should not crash.');"));
 
   AppModalDialog* alert = ui_test_utils::WaitForAppModalDialog();
   ASSERT_TRUE(alert);
   alert->CloseModalDialog();
 }