Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InjectedScriptHost.cpp

 /*
  * Copyright (C) 2007, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2010 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 27 matching lines @@
 #include "core/inspector/InstrumentingAgents.h"
 #include "platform/JSONValues.h"
 
 #include "wtf/RefPtr.h"
 #include "wtf/text/StringBuilder.h"
 
 using namespace std;
 
 namespace WebCore {
 
-PassRefPtr<InjectedScriptHost> InjectedScriptHost::create()
+PassRefPtrWillBeRawPtr<InjectedScriptHost> InjectedScriptHost::create()
 {
-    return adoptRef(new InjectedScriptHost());
+    return adoptRefWillBeNoop(new InjectedScriptHost());
 }
 
 InjectedScriptHost::InjectedScriptHost()
-    : m_instrumentingAgents(0)
+    : m_instrumentingAgents(nullptr)
     , m_scriptDebugServer(0)
 {
     ScriptWrappable::init(this);
     m_defaultInspectableObject = adoptPtr(new InspectableObject());
 }
 
 InjectedScriptHost::~InjectedScriptHost()
 {
 }
 
+void InjectedScriptHost::trace(Visitor* visitor)
+{
+    visitor->trace(m_instrumentingAgents);
+}
+
 void InjectedScriptHost::disconnect()
 {
-    m_instrumentingAgents = 0;
+    m_instrumentingAgents = nullptr;
     m_scriptDebugServer = 0;
 }
 
 void InjectedScriptHost::inspectImpl(PassRefPtr<JSONValue> object, PassRefPtr<JSONValue> hints)
 {
     if (InspectorInspectorAgent* inspectorAgent = m_instrumentingAgents ? m_instrumentingAgents->inspectorInspectorAgent() : 0) {
         RefPtr<TypeBuilder::Runtime::RemoteObject> remoteObject = TypeBuilder::Runtime::RemoteObject::runtimeCast(object);
         inspectorAgent->inspect(remoteObject, hints->asObject());
     }
 }
@@ skipping 61 matching lines @@
 }
 
 void InjectedScriptHost::unmonitorFunction(const String& scriptId, int lineNumber, int columnNumber)
 {
     if (InspectorDebuggerAgent* debuggerAgent = m_instrumentingAgents ? m_instrumentingAgents->inspectorDebuggerAgent() : 0)
         debuggerAgent->removeBreakpoint(scriptId, lineNumber, columnNumber, InspectorDebuggerAgent::MonitorCommandBreakpointSource);
 }
 
 } // namespace WebCore