ServiceWorker: Fix registration refcount handling in the renderer

content/child/service_worker/service_worker_message_filter.cc

Index: content/child/service_worker/service_worker_message_filter.cc
diff --git a/content/child/service_worker/service_worker_message_filter.cc b/content/child/service_worker/service_worker_message_filter.cc
index 9b3cd56918423596ee321337f14294bf640f53f2..b0554c003d7e5ba68c7268d50585f736f342dca1 100644
--- a/content/child/service_worker/service_worker_message_filter.cc
+++ b/content/child/service_worker/service_worker_message_filter.cc
@@ -104,8 +104,8 @@ void ServiceWorkerMessageFilter::OnStaleSetVersionAttributes(
                                    attrs.waiting.handle_id);
   SendServiceWorkerObjectDestroyed(thread_safe_sender_.get(),
                                    attrs.active.handle_id);
-  SendRegistrationObjectDestroyed(thread_safe_sender_.get(),
-                                  registration_handle_id);
+  // Don't have to decrement registration refcount because the sender of the
+  // SetVersionAttributes message doesn't increment it.
 }
 
 void ServiceWorkerMessageFilter::OnStaleSetControllerServiceWorker(