Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/loader/navigation_url_loader_impl_core.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/loader/navigation_url_loader_impl_core.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/time/time.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ skipping 129 matching lines @@
                          "&NavigationURLLoaderImplCore", this, "success",
                          false);
 
   BrowserThread::PostTask(
       BrowserThread::UI, FROM_HERE,
       base::Bind(&NavigationURLLoaderImpl::NotifyRequestFailed, loader_,
                  in_cache, net_error));
 }
 
 void NavigationURLLoaderImplCore::OnServiceWorkerChecksPerformed(
-      ServiceWorkerStatusCode status,
-      const scoped_refptr<ServiceWorkerRegistration>& registration) {
+    ServiceWorkerStatusCode status,
+    scoped_refptr<ServiceWorkerRegistration> registration) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   // If the navigation has a ServiceWorker, bail out immediately.
   // TODO(clamy): only bail out when the ServiceWorker has a Fetch event
   // handler.
   if (status == SERVICE_WORKER_OK) {
     BrowserThread::PostTask(
         BrowserThread::UI, FROM_HERE,
         base::Bind(&NavigationURLLoaderImpl::NotifyServiceWorkerEncountered,
                    loader_));
     return;
   }
 
   // Otherwise, start the navigation in the network stack.
 
   // The ResourceDispatcherHostImpl can be null in unit tests.
   if (!ResourceDispatcherHostImpl::Get())
     return;
 
   ResourceDispatcherHostImpl::Get()->BeginNavigationRequest(
       resource_context_, *request_info_, this);
 }
 
 }  // namespace content