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 20fbb0e2c45ddfaa25e0a8baf266025fe0bb9bb3..2d1e7b11e87f6abf35e4aabd8061bf4c6df0fe56 100644
--- a/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
+++ b/Source/modules/serviceworkers/ServiceWorkerContainer.cpp
@@ -122,6 +122,10 @@ public:
         ASSERT(!worker); // Anything passed here will be leaked.
         return V8UndefinedType();
     }
+    static void dispose(WebServiceWorker* worker)
+    {
+        ASSERT(!worker); // Anything passed here will be leaked.
+    }
 
 private:
     UndefinedValue();