Stop passing const-reference of SWRegistration in all GetRegistrationsCallbacks.

content/browser/service_worker/service_worker_context_core.h

Index: content/browser/service_worker/service_worker_context_core.h
diff --git a/content/browser/service_worker/service_worker_context_core.h b/content/browser/service_worker/service_worker_context_core.h
index 71dcfe8d69eb949e99cc2f6b180a30d8fceb1caa..472ebe28ffd72766d4dec9ccb93f9e1fcd5a0263 100644
--- a/content/browser/service_worker/service_worker_context_core.h
+++ b/content/browser/service_worker/service_worker_context_core.h
@@ -333,10 +333,10 @@ class CONTENT_EXPORT ServiceWorkerContextCore
       const GURL& other_url,
       const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
       ServiceWorkerStatusCode status,
-      const scoped_refptr<ServiceWorkerRegistration>& registration);
+      scoped_refptr<ServiceWorkerRegistration> registration);
   void OnRegistrationFinishedForCheckHasServiceWorker(
       const ServiceWorkerContext::CheckHasServiceWorkerCallback callback,
-      const scoped_refptr<ServiceWorkerRegistration>& registration);
+      scoped_refptr<ServiceWorkerRegistration> registration);
 
   // It's safe to store a raw pointer instead of a scoped_refptr to |wrapper_|
   // because the Wrapper::Shutdown call that hops threads to destroy |this| uses