Convert HtmlDialogUIDelegate::GetDialogTitle() to string16.

chrome/browser/browser_signin.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/browser_signin.h"
 
 #include <string>
 #include <vector>
 
 #include "base/json/json_reader.h"
@@ skipping 65 matching lines @@
  public:
   BrowserSigninHtml(BrowserSignin* signin,
                     const string16& suggested_email,
                     const string16& login_message);
   virtual ~BrowserSigninHtml() {}
 
   // HtmlDialogUIDelegate implementation
   virtual bool IsDialogModal() const OVERRIDE {
     return false;
   };
-  virtual std::wstring GetDialogTitle() const OVERRIDE {
-    return L"";
+  virtual string16 GetDialogTitle() const OVERRIDE {
+    return string16();
   }
   virtual GURL GetDialogContentURL() const OVERRIDE {
     return GURL("chrome://dialog/signin");
   }
   virtual void GetWebUIMessageHandlers(
       std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE {
     const WebUIMessageHandler* handler = this;
     handlers->push_back(const_cast<WebUIMessageHandler*>(handler));
   }
   virtual void GetDialogSize(gfx::Size* size) const OVERRIDE {
@@ skipping 228 matching lines @@
 
 void BrowserSignin::ShowSigninTabModal(TabContents* tab_contents) {
 //  TODO(johnnyg): Need a linux views implementation for ConstrainedHtmlDialog.
 #if defined(OS_WIN) || defined(OS_CHROMEOS) || !defined(TOOLKIT_VIEWS)
   html_dialog_ui_delegate_ = CreateHtmlDialogUI();
   ConstrainedHtmlUI::CreateConstrainedHtmlDialog(profile_,
                                                  html_dialog_ui_delegate_,
                                                  tab_contents);
 #endif
 }