Oilpan: Remove raw pointer to InProcessWorkerBase from WorkerMessagingProxy

Source/core/workers/WorkerGlobalScopeProxy.h

Index: Source/core/workers/WorkerGlobalScopeProxy.h
diff --git a/Source/core/workers/WorkerGlobalScopeProxy.h b/Source/core/workers/WorkerGlobalScopeProxy.h
index 74dfe51dfa6daa91a084dfa652eb64ee5717a5c1..d43e7243dd1d566aa26e6db3e3c039f0a6789482 100644
--- a/Source/core/workers/WorkerGlobalScopeProxy.h
+++ b/Source/core/workers/WorkerGlobalScopeProxy.h
@@ -42,9 +42,10 @@ namespace blink {
 class KURL;
 
 // A proxy to talk to the worker global scope.
-class CORE_EXPORT WorkerGlobalScopeProxy {
+class CORE_EXPORT WorkerGlobalScopeProxy : public NoBaseWillBeGarbageCollectedFinalized<WorkerGlobalScopeProxy> {
 public:
     virtual ~WorkerGlobalScopeProxy() { }
+    DEFINE_INLINE_VIRTUAL_TRACE() { }
 
     virtual void startWorkerGlobalScope(const KURL& scriptURL, const String& userAgent, const String& sourceCode, WorkerThreadStartMode) = 0;