ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

Source/modules/serviceworkers/ServiceWorkerContainer.cpp

Index: Source/modules/serviceworkers/ServiceWorkerContainer.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerContainer.cpp b/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
index 1b314266d3baaa47107bdabbe00ef766cff9dbe6..b2cbfdf13d4a070c480c6330f2386fcac0f6896d 100644
--- a/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
@@ -130,7 +130,6 @@ ScriptPromise ServiceWorkerContainer::registerServiceWorker(ScriptState* scriptS
 
 class UndefinedValue {
 public:
-
 #ifdef DISABLE_SERVICE_WORKER_REGISTRATION
     typedef WebServiceWorker WebType;
 #else
@@ -141,6 +140,10 @@ public:
         ASSERT(!registration); // Anything passed here will be leaked.
         return V8UndefinedType();
     }
+    static void dispose(WebServiceWorker* worker)
+    {
+        ASSERT(!worker); // Anything passed here will be leaked.
+    }
 
 private:
     UndefinedValue();