Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/service_worker/service_worker_context_core.cc

 // Copyright 2013 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/service_worker/service_worker_context_core.h"
 
 #include <limits>
 #include <set>
 #include <utility>
 
@@ skipping 805 matching lines @@
 }
 
 ServiceWorkerProcessManager* ServiceWorkerContextCore::process_manager() {
   return wrapper_->process_manager();
 }
 
 void ServiceWorkerContextCore::DidFindRegistrationForCheckHasServiceWorker(
     const GURL& other_url,
     const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
     ServiceWorkerStatusCode status,
-    const scoped_refptr<ServiceWorkerRegistration>& registration) {
+    scoped_refptr<ServiceWorkerRegistration> registration) {
   if (status != SERVICE_WORKER_OK) {
     callback.Run(false);
     return;
   }
 
   if (!ServiceWorkerUtils::ScopeMatches(registration->pattern(), other_url)) {
     callback.Run(false);
     return;
   }
 
   if (registration->is_uninstalling() || registration->is_uninstalled()) {
     callback.Run(false);
     return;
   }
 
   if (!registration->active_version() && !registration->waiting_version()) {
     registration->RegisterRegistrationFinishedCallback(
         base::Bind(&ServiceWorkerContextCore::
                        OnRegistrationFinishedForCheckHasServiceWorker,
                    AsWeakPtr(), callback, registration));
     return;
   }
 
   callback.Run(true);
 }
 
 void ServiceWorkerContextCore::OnRegistrationFinishedForCheckHasServiceWorker(
     const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
-    const scoped_refptr<ServiceWorkerRegistration>& registration) {
+    scoped_refptr<ServiceWorkerRegistration> registration) {
   callback.Run(registration->active_version() ||
                registration->waiting_version());
 }
 
 }  // namespace content