Convert infobar APIs to UTF-16.

chrome/browser/extensions/crashed_extension_infobar.h

 // Copyright (c) 2009 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_EXTENSIONS_CRASHED_EXTENSION_INFOBAR_H_
 #define CHROME_BROWSER_EXTENSIONS_CRASHED_EXTENSION_INFOBAR_H_
 #pragma once
 
 #include <string>
 
@@ skipping 16 matching lines @@
                                   const Extension* extension);
 
   const std::string extension_id() { return extension_id_; }
 
   // InfoBarDelegate
   virtual CrashedExtensionInfoBarDelegate* AsCrashedExtensionInfoBarDelegate() {
     return this;
   }
 
   // ConfirmInfoBarDelegate
-  virtual std::wstring GetMessageText() const;
+  virtual string16 GetMessageText() const;
   virtual void InfoBarClosed();
   virtual SkBitmap* GetIcon() const;
   virtual int GetButtons() const;
-  virtual std::wstring GetButtonLabel(
+  virtual string16 GetButtonLabel(
       ConfirmInfoBarDelegate::InfoBarButton button) const;
   virtual bool Accept();
 
  private:
   ExtensionsService* extensions_service_;
 
   const std::string extension_id_;
   const std::string extension_name_;
 
   DISALLOW_COPY_AND_ASSIGN(CrashedExtensionInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_CRASHED_EXTENSION_INFOBAR_H_