Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/background_sync/background_sync_manager_unittest.cc

 // Copyright 2015 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/background_sync/background_sync_manager.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 48 matching lines @@
                                    const std::string& status_message,
                                    int64_t registration_id) {
   EXPECT_EQ(SERVICE_WORKER_OK, status) << ServiceWorkerStatusToString(status);
   *called = true;
   *store_registration_id = registration_id;
 }
 
 void FindServiceWorkerRegistrationCallback(
     scoped_refptr<ServiceWorkerRegistration>* out_registration,
     ServiceWorkerStatusCode status,
-    const scoped_refptr<ServiceWorkerRegistration>& registration) {
+    scoped_refptr<ServiceWorkerRegistration> registration) {
   EXPECT_EQ(SERVICE_WORKER_OK, status) << ServiceWorkerStatusToString(status);
-  *out_registration = registration;
+  *out_registration = std::move(registration);
 }
 
 void UnregisterServiceWorkerCallback(bool* called,
                                      ServiceWorkerStatusCode code) {
   EXPECT_EQ(SERVICE_WORKER_OK, code);
   *called = true;
 }
 
 void DispatchSyncSuccessfulCallback(
     int* count,
@@ skipping 1232 matching lines @@
   // Run it again.
   test_clock_->Advance(test_background_sync_manager_->delayed_task_delta());
   test_background_sync_manager_->delayed_task().Run();
   base::RunLoop().RunUntilIdle();
   EXPECT_FALSE(GetRegistration(sync_options_1_));
   EXPECT_EQ(blink::mojom::BackgroundSyncEventLastChance::IS_LAST_CHANCE,
             test_background_sync_manager_->last_chance());
 }
 
 }  // namespace content