Clear WorkerGlobalScope::m_thread in WorkerGlobalScope::dispose()

third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp

Index: third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp
index e1aff2aec72b87ffba4af9a81c36b36f0783a39a..b4596c1b9fffe2692d7cdd069c46210b7f82edae 100644
--- a/third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerGlobalScope.cpp
@@ -210,16 +210,7 @@ void WorkerGlobalScope::dispose()
     clearScript();
     clearInspector();
     m_eventQueue->close();
-
-    // We do not clear the thread field of the
-    // WorkerGlobalScope. Other objects keep the worker global scope
-    // alive because they need its thread field to check that work is
-    // being carried out on the right thread. We therefore cannot clear
-    // the thread field before all references to the worker global
-    // scope are gone.
-    //
-    // TODO(haraken): It's nasty to keep a raw pointer to WorkerThread
-    // after disposing WorkerGlobalScope. m_thread should be cleared here.
+    m_thread = nullptr;
 }
 
 void WorkerGlobalScope::didEvaluateWorkerScript()