Fix crash in ServiceWorkerDispatcherHost

content/browser/service_worker/service_worker_dispatcher_host.cc

Index: content/browser/service_worker/service_worker_dispatcher_host.cc
diff --git a/content/browser/service_worker/service_worker_dispatcher_host.cc b/content/browser/service_worker/service_worker_dispatcher_host.cc
index 6f1d95f078618c9c207087699ef8b185bcc20c84..872ac5735eab12be49c281e6448c2905f9df5e47 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host.cc
@@ -570,6 +570,9 @@ void ServiceWorkerDispatcherHost::OnSetHostedVersionId(
   ServiceWorkerRegistration* registration =
       GetContext()->GetLiveRegistration(version->registration_id());
   DCHECK(registration);
+  // TODO(ksakamoto): This is a quick fix for crbug.com/459916.
+  if (!registration)
+    return;
 
   // Set the document URL to the script url in order to allow
   // register/unregister/getRegistration on ServiceWorkerGlobalScope.