ServiceWorker: Bypass resolving a promise when ExecutionContext is gone

Source/modules/serviceworkers/ServiceWorkerRegistration.cpp

Index: Source/modules/serviceworkers/ServiceWorkerRegistration.cpp
diff --git a/Source/modules/serviceworkers/ServiceWorkerRegistration.cpp b/Source/modules/serviceworkers/ServiceWorkerRegistration.cpp
index 562b289d593064987e762a8f04dcca9ff063a0f8..8758b29a8da8aa64358d9717b9bb31a3bb23c3c6 100644
--- a/Source/modules/serviceworkers/ServiceWorkerRegistration.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerRegistration.cpp
@@ -31,6 +31,10 @@ public:
         ASSERT(!registration); // Anything passed here will be leaked.
         return V8UndefinedType();
     }
+    static void dispose(WebType* registration)
+    {
+        ASSERT(!registration); // Anything passed here will be leaked.
+    }
 
 private:
     UndefinedValue();