Dispatch the ServiceWorker "activate" event during activation

Source/modules/serviceworkers/InstallPhaseEvent.h

Index: Source/modules/serviceworkers/InstallPhaseEvent.h
diff --git a/Source/modules/serviceworkers/InstallPhaseEvent.h b/Source/modules/serviceworkers/InstallPhaseEvent.h
index 8cc1e74f92fa9202bbbffac8dd6380659a6bdda3..f7410a1d04000df15f80c73c29c3b216c84bbe72 100644
--- a/Source/modules/serviceworkers/InstallPhaseEvent.h
+++ b/Source/modules/serviceworkers/InstallPhaseEvent.h
@@ -41,6 +41,7 @@ class WaitUntilObserver;
 class InstallPhaseEvent : public Event {
 public:
     static PassRefPtrWillBeRawPtr<InstallPhaseEvent> create();
+    static PassRefPtrWillBeRawPtr<InstallPhaseEvent> create(const AtomicString& type, const EventInit&, PassRefPtr<WaitUntilObserver>);
 
     virtual ~InstallPhaseEvent();