Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/service_worker/service_worker_read_from_cache_job_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/service_worker/service_worker_read_from_cache_job.h"
 
 #include <stdint.h>
 
 #include <memory>
 
@@ skipping 29 matching lines @@
                           const base::Closure& quit_closure,
                           ServiceWorkerStatusCode status) {
   *status_out = status;
   quit_closure.Run();
 }
 
 void DidFindRegistration(
     ServiceWorkerStatusCode* status_out,
     const base::Closure& quit_closure,
     ServiceWorkerStatusCode status,
-    const scoped_refptr<ServiceWorkerRegistration>& registration) {
+    scoped_refptr<ServiceWorkerRegistration> registration) {
   *status_out = status;
   quit_closure.Run();
 }
 
 }  // namespace
 
 class ServiceWorkerReadFromCacheJobTest : public testing::Test {
  public:
   ServiceWorkerReadFromCacheJobTest()
       : thread_bundle_(TestBrowserThreadBundle::IO_MAINLOOP),
@@ skipping 180 matching lines @@
   EXPECT_EQ(net::ERR_CACHE_MISS, request->status().error());
   EXPECT_EQ(SERVICE_WORKER_ERROR_DISK_CACHE,
             DeduceStartWorkerFailureReason(SERVICE_WORKER_OK));
 
   // The version should be doomed by the job.
   EXPECT_EQ(ServiceWorkerVersion::REDUNDANT, version_->status());
   EXPECT_EQ(SERVICE_WORKER_ERROR_NOT_FOUND, FindRegistration());
 }
 
 }  // namespace content