Oilpan: Remove raw pointer to InProcessWorkerBase from WorkerMessagingProxy

Source/core/workers/InProcessWorkerBase.cpp

Index: Source/core/workers/InProcessWorkerBase.cpp
diff --git a/Source/core/workers/InProcessWorkerBase.cpp b/Source/core/workers/InProcessWorkerBase.cpp
index 2250c7380f4d6a5a83574052d95fdfc6e4d2f13f..54ac1cc0d1dc66c16ad8042237ed81033cc56f0f 100644
--- a/Source/core/workers/InProcessWorkerBase.cpp
+++ b/Source/core/workers/InProcessWorkerBase.cpp
@@ -28,9 +28,11 @@ InProcessWorkerBase::InProcessWorkerBase(ExecutionContext* context)
 InProcessWorkerBase::~InProcessWorkerBase()
 {
     ASSERT(isMainThread());
+#if !ENABLE(OILPAN)
     if (!m_contextProxy)
         return;
     m_contextProxy->workerObjectDestroyed();
+#endif
 }
 
 void InProcessWorkerBase::postMessage(ExecutionContext* context, PassRefPtr<SerializedScriptValue> message, const MessagePortArray* ports, ExceptionState& exceptionState)
@@ -112,6 +114,7 @@ void InProcessWorkerBase::onFinished()
 DEFINE_TRACE(InProcessWorkerBase)
 {
     visitor->trace(m_contentSecurityPolicy);
+    visitor->trace(m_contextProxy);
     AbstractWorker::trace(visitor);
 }