Convert HtmlDialogUIDelegate::GetDialogTitle() to string16.

chrome/browser/chromeos/choose_mobile_network_dialog.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_CHOOSE_MOBILE_NETWORK_DIALOG_H_
 #define CHROME_BROWSER_CHROMEOS_CHOOSE_MOBILE_NETWORK_DIALOG_H_
 
 #include "chrome/browser/ui/webui/html_dialog_ui.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace chromeos {
 
 // Dialog for manual selection of cellular network.
 class ChooseMobileNetworkDialog : private HtmlDialogUIDelegate {
  public:
   // Shows the dialog box.
   static void ShowDialog(gfx::NativeWindow owning_window);
 
  private:
   ChooseMobileNetworkDialog();
 
   // Overridden from HtmlDialogUI::Delegate:
   virtual bool IsDialogModal() const OVERRIDE;
-  virtual std::wstring GetDialogTitle() const OVERRIDE;
+  virtual string16 GetDialogTitle() const OVERRIDE;
   virtual GURL GetDialogContentURL() const OVERRIDE;
   virtual void GetWebUIMessageHandlers(
       std::vector<WebUIMessageHandler*>* handlers) const OVERRIDE;
   virtual void GetDialogSize(gfx::Size* size) const OVERRIDE;
   virtual std::string GetDialogArgs() const OVERRIDE;
   virtual void OnDialogClosed(const std::string& json_retval) OVERRIDE;
   virtual void OnCloseContents(
       TabContents* source, bool* out_close_dialog) OVERRIDE;
   virtual bool ShouldShowDialogTitle() const OVERRIDE;
   virtual bool HandleContextMenu(const ContextMenuParams& params) OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(ChooseMobileNetworkDialog);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_CHOOSE_MOBILE_NETWORK_DIALOG_H_