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 e662c64ee0528503f9b5aa773fdaf6b907226ac8..4656870c806cd9351ea51af8c798d80f69a236fc 100644
--- a/Source/core/workers/WorkerGlobalScope.cpp
+++ b/Source/core/workers/WorkerGlobalScope.cpp
@@ -221,6 +221,8 @@ 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()