Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorInspectorAgent.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 45 matching lines @@
     : InspectorBaseAgent<InspectorInspectorAgent>("Inspector")
     , m_inspectedPage(page)
     , m_frontend(0)
     , m_injectedScriptManager(injectedScriptManager)
 {
     ASSERT_ARG(page, page);
 }
 
 InspectorInspectorAgent::~InspectorInspectorAgent()
 {
+#if !ENABLE(OILPAN)
     m_instrumentingAgents->setInspectorInspectorAgent(0);
+#endif
+}
+
+void InspectorInspectorAgent::trace(Visitor* visitor)
+{
+    visitor->trace(m_inspectedPage);
+    InspectorBaseAgent::trace(visitor);
 }
 
 void InspectorInspectorAgent::didClearDocumentOfWindowObject(LocalFrame* frame)
 {
     if (m_injectedScriptForOrigin.isEmpty())
         return;
 
     String origin = frame->document()->securityOrigin()->toRawString();
     String script = m_injectedScriptForOrigin.get(origin);
     if (script.isEmpty())
@@ skipping 75 matching lines @@
         m_frontend->inspector()->inspect(objectToInspect, hints);
         m_pendingInspectData.first = nullptr;
         m_pendingInspectData.second = nullptr;
         return;
     }
     m_pendingInspectData.first = objectToInspect;
     m_pendingInspectData.second = hints;
 }
 
 } // namespace WebCore