ExtendableEvent and InstallEvent should have an EventConstructor

Source/web/ServiceWorkerGlobalScopeProxy.cpp

Index: Source/web/ServiceWorkerGlobalScopeProxy.cpp
diff --git a/Source/web/ServiceWorkerGlobalScopeProxy.cpp b/Source/web/ServiceWorkerGlobalScopeProxy.cpp
index 7ec351264510c662e970a194a3fbe2fe85e73683..3ce626289381ba9a177a78b40a964d2e2c6100bf 100644
--- a/Source/web/ServiceWorkerGlobalScopeProxy.cpp
+++ b/Source/web/ServiceWorkerGlobalScopeProxy.cpp
@@ -79,7 +79,7 @@ void ServiceWorkerGlobalScopeProxy::dispatchActivateEvent(int eventID)
 {
     ASSERT(m_workerGlobalScope);
     WaitUntilObserver* observer = WaitUntilObserver::create(m_workerGlobalScope, WaitUntilObserver::Activate, eventID);
-    RefPtrWillBeRawPtr<Event> event(ExtendableEvent::create(EventTypeNames::activate, EventInit(), observer));
+    RefPtrWillBeRawPtr<Event> event(ExtendableEvent::create(EventTypeNames::activate, ExtendableEventInit(), observer));
     m_workerGlobalScope->dispatchExtendableEvent(event.release(), observer);
 }