Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/notifications/notification_message_filter.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/browser/notifications/notification_message_filter.h"
 
 #include <utility>
 
 #include "base/callback.h"
 #include "content/browser/bad_message.h"
@@ skipping 204 matching lines @@
                  persistent_notification_id));
 }
 
 void NotificationMessageFilter::DidFindServiceWorkerRegistration(
     int request_id,
     const GURL& origin,
     const PlatformNotificationData& notification_data,
     const NotificationResources& notification_resources,
     int64_t persistent_notification_id,
     content::ServiceWorkerStatusCode service_worker_status,
-    const scoped_refptr<content::ServiceWorkerRegistration>& registration) {
+    scoped_refptr<content::ServiceWorkerRegistration> registration) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   if (service_worker_status != SERVICE_WORKER_OK) {
     Send(new PlatformNotificationMsg_DidShowPersistent(request_id, false));
     LOG(ERROR) << "Registration not found for " << origin.spec();
     // TODO(peter): Add UMA to track how often this occurs.
     return;
   }
 
   PlatformNotificationService* service =
@@ skipping 126 matching lines @@
       service->CheckPermissionOnUIThread(browser_context_, origin, process_id_);
 
   if (permission_status == blink::mojom::PermissionStatus::GRANTED)
     return true;
 
   bad_message::ReceivedBadMessage(this, bad_message::NMF_NO_PERMISSION_VERIFY);
   return false;
 }
 
 }  // namespace content