ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

Source/modules/serviceworkers/ServiceWorker.cpp

Index: Source/modules/serviceworkers/ServiceWorker.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorker.cpp b/Source/modules/serviceworkers/ServiceWorker.cpp
index 25e449d44977d6fac532b0ad79f381041c8355ee..69f3f59c31c31617f7a913420f0f32b2a7fbd200 100644
--- a/Source/modules/serviceworkers/ServiceWorker.cpp
+++ b/Source/modules/serviceworkers/ServiceWorker.cpp
@@ -163,6 +163,12 @@ PassRefPtrWillBeRawPtr<ServiceWorker> ServiceWorker::from(ScriptPromiseResolver*
     return serviceWorker;
 }
 
+void ServiceWorker::dispose(WebType* worker)
+{
+    if (worker && !worker->proxy())
+        delete worker;
+}
+
 void ServiceWorker::setProxyState(ProxyState state)
 {
     if (m_proxyState == state)