BackgroundSync sync events need to be ExtendableEvents, content side

content/renderer/service_worker/service_worker_script_context.cc

Index: content/renderer/service_worker/service_worker_script_context.cc
diff --git a/content/renderer/service_worker/service_worker_script_context.cc b/content/renderer/service_worker/service_worker_script_context.cc
index 1930f93c0dbebabb0fb4428ee8301980ea9ff401..d314ce78890d7a01486e9464516d1a30445ec03a 100644
--- a/content/renderer/service_worker/service_worker_script_context.cc
+++ b/content/renderer/service_worker/service_worker_script_context.cc
@@ -218,9 +218,11 @@ void ServiceWorkerScriptContext::DidHandlePushEvent(
       GetRoutingID(), request_id, result));
 }
 
-void ServiceWorkerScriptContext::DidHandleSyncEvent(int request_id) {
-  Send(new ServiceWorkerHostMsg_SyncEventFinished(
-      GetRoutingID(), request_id));
+void ServiceWorkerScriptContext::DidHandleSyncEvent(
+    int request_id,
+    blink::WebServiceWorkerEventResult result) {
+  Send(new ServiceWorkerHostMsg_SyncEventFinished(GetRoutingID(), request_id,
+                                                  result));
 }
 
 void ServiceWorkerScriptContext::DidHandleCrossOriginConnectEvent(