LifecycleObserver::contextDestroyed should be explicitly dispatched promptly when a context is dest…

Source/core/workers/WorkerGlobalScope.cpp

Index: Source/core/workers/WorkerGlobalScope.cpp
diff --git a/Source/core/workers/WorkerGlobalScope.cpp b/Source/core/workers/WorkerGlobalScope.cpp
index 7dec847dfed9a73cc6ae13e1443be98a8940b9aa..82cb4fbdde27d624aa30fcaf088d465cc4512fb6 100644
--- a/Source/core/workers/WorkerGlobalScope.cpp
+++ b/Source/core/workers/WorkerGlobalScope.cpp
@@ -214,6 +214,8 @@ void WorkerGlobalScope::dispose()
     // being carried out on the right thread. We therefore cannot clear
     // the thread field before all references to the worker global
     // scope are gone.
+
+    ExecutionContext::contextDestroyed();
 }
 
 void WorkerGlobalScope::didEvaluateWorkerScript()