Add terminateServiceWorker method for layout tests - chromium side

content/child/service_worker/web_service_worker_impl.cc

Index: content/child/service_worker/web_service_worker_impl.cc
diff --git a/content/child/service_worker/web_service_worker_impl.cc b/content/child/service_worker/web_service_worker_impl.cc
index dcd69ca8a902799d1dba64dea0398819785c5a6d..905fdaa7cbe1fe1cacb3f76c8c03e72f3f5ed866 100644
--- a/content/child/service_worker/web_service_worker_impl.cc
+++ b/content/child/service_worker/web_service_worker_impl.cc
@@ -89,6 +89,11 @@ void WebServiceWorkerImpl::postMessage(const WebString& message,
       WebMessagePortChannelImpl::ExtractMessagePortIDs(channels)));
 }
 
+void WebServiceWorkerImpl::terminate() {
+  thread_safe_sender_->Send(
+      new ServiceWorkerHostMsg_TerminateWorker(handle_ref_->handle_id()));
+}
+
 void WebServiceWorkerImpl::CommitState(blink::WebServiceWorkerState new_state) {
   DCHECK(proxy_);
   DCHECK(proxy_->isReady());