Check the existence of SWContext in DidUpdateNavigationPreloadEnabled/Hexistence

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 b105177362fbcb2cdc4518d473ae8b5e7695af24..a5b344bc87eac2d0c5ac84d792aadabe422d3c51 100644
--- a/content/browser/service_worker/service_worker_dispatcher_host.cc
+++ b/content/browser/service_worker/service_worker_dispatcher_host.cc
@@ -1552,6 +1552,8 @@ void ServiceWorkerDispatcherHost::DidUpdateNavigationPreloadEnabled(
             std::string(kDatabaseErrorMessage)));
     return;
   }
+  if (!GetContext())
+    return;
   ServiceWorkerRegistration* registration =
       GetContext()->GetLiveRegistration(registration_id);
   if (registration)
@@ -1572,6 +1574,8 @@ void ServiceWorkerDispatcherHost::DidUpdateNavigationPreloadHeader(
             std::string(kDatabaseErrorMessage)));
     return;
   }
+  if (!GetContext())
+    return;
   ServiceWorkerRegistration* registration =
       GetContext()->GetLiveRegistration(registration_id);
   if (registration)