Convert HtmlDialogUIDelegate::GetDialogTitle() to string16.

chrome/browser/ui/login/login_prompt_ui.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/ui/login/login_prompt.h"
 
 #include <string>
 
 #include "base/json/json_reader.h"
 #include "base/utf_string_conversions.h"
@@ skipping 68 matching lines @@
         closed_(false),
         has_autofill_(false),
         ready_for_autofill_(false) {
   }
 
   // HtmlDialogUIDelegate methods:
   virtual bool IsDialogModal() const OVERRIDE {
     return true;
   }
 
-  virtual std::wstring GetDialogTitle() const OVERRIDE {
-    return UTF16ToWide(l10n_util::GetStringUTF16(IDS_LOGIN_DIALOG_TITLE));
+  virtual string16 GetDialogTitle() const OVERRIDE {
+    return l10n_util::GetStringUTF16(IDS_LOGIN_DIALOG_TITLE);
   }
 
   virtual GURL GetDialogContentURL() const OVERRIDE {
     return GURL(chrome::kChromeUIHttpAuthURL);
   }
 
   virtual void GetWebUIMessageHandlers(
       std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE {
     const WebUIMessageHandler* handler = this;
     handlers->push_back(const_cast<WebUIMessageHandler*>(handler));
@@ skipping 149 matching lines @@
   SetDialog(dialog);
 
   NotifyAuthNeeded();
 }
 
 // static
 LoginHandler* LoginHandler::Create(net::AuthChallengeInfo* auth_info,
                                    net::URLRequest* request) {
   return new LoginHandlerHtml(auth_info, request);
 }