Make UTF16ToASCII and UTF16TOUTF8 take a StringPiece

content/child/notifications/notification_manager.cc

 // Copyright 2014 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 "content/child/notifications/notification_manager.h"
 
 #include <cmath>
 
 #include "base/lazy_instance.h"
 #include "base/metrics/histogram_macros.h"
@@ skipping 143 matching lines @@
   int request_id =
       notification_dispatcher_->GenerateNotificationId(CurrentWorkerId());
 
   pending_get_notification_requests_.AddWithID(callbacks, request_id);
 
   thread_safe_sender_->Send(
       new PlatformNotificationHostMsg_GetNotifications(
           request_id,
           service_worker_registration_id,
           origin,
-          base::UTF16ToUTF8(filter_tag)));
+          base::UTF16ToUTF8(base::StringPiece16(filter_tag))));
 }
 
 void NotificationManager::close(blink::WebNotificationDelegate* delegate) {
   if (pending_notifications_.CancelPageNotificationFetches(delegate))
     return;
 
   for (auto& iter : active_page_notifications_) {
     if (iter.second != delegate)
       continue;
 
@@ skipping 162 matching lines @@
 
   // TODO(mkwst): This is potentially doing the wrong thing with unique
   // origins. Perhaps also 'file:', 'blob:' and 'filesystem:'. See
   // https://crbug.com/490074 for detail.
   thread_safe_sender_->Send(new PlatformNotificationHostMsg_ShowPersistent(
       request_id, service_worker_registration_id, GURL(origin.toString()), icon,
       ToPlatformNotificationData(notification_data)));
 }
 
 }  // namespace content