Use utf_string_conversions header in more places.

chrome/browser/notifications/desktop_notification_service.cc

 // 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.
 
 #include "chrome/browser/notifications/desktop_notification_service.h"
 
 #include "app/l10n_util.h"
 #include "app/resource_bundle.h"
-#include "base/string_piece.h"
-#include "base/string_util.h"
 #include "base/thread.h"
+#include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_list.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_object_proxy.h"
 #include "chrome/browser/notifications/notification_ui_manager.h"
 #include "chrome/browser/notifications/notifications_prefs_cache.h"
 #include "chrome/browser/profile.h"
 #include "chrome/browser/renderer_host/render_process_host.h"
 #include "chrome/browser/renderer_host/render_view_host.h"
@@ skipping 339 matching lines @@
   if (origin.SchemeIs(chrome::kExtensionScheme)) {
     ExtensionsService* ext_service = profile_->GetExtensionsService();
     if (ext_service) {
       Extension* extension = ext_service->GetExtensionByURL(origin);
       if (extension)
         return ASCIIToWide(extension->name());
     }
   }
   return UTF8ToWide(origin.spec());
 }