Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/DOMEditor.h

 /*
  * Copyright (C) 2012 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 13 matching lines @@
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef DOMEditor_h
 #define DOMEditor_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class Element;
 class ExceptionState;
 class InspectorHistory;
 class Node;
 class Text;
 
 typedef String ErrorString;
 
-class DOMEditor {
-    WTF_MAKE_NONCOPYABLE(DOMEditor); WTF_MAKE_FAST_ALLOCATED;
+class DOMEditor FINAL : public NoBaseWillBeGarbageCollected<DOMEditor> {
+    WTF_MAKE_NONCOPYABLE(DOMEditor);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
     explicit DOMEditor(InspectorHistory*);
-    ~DOMEditor();
+
+    void trace(Visitor*);
 
     bool insertBefore(Node* parentNode, PassRefPtr<Node>, Node* anchorNode, ExceptionState&);
     bool removeChild(Node* parentNode, Node*, ExceptionState&);
     bool setAttribute(Element*, const String& name, const String& value, ExceptionState&);
     bool removeAttribute(Element*, const String& name, ExceptionState&);
     bool setOuterHTML(Node*, const String& html, Node** newNode, ExceptionState&);
     bool replaceWholeText(Text*, const String& text, ExceptionState&);
     bool replaceChild(Node* parentNode, PassRefPtr<Node> newNode, Node* oldNode, ExceptionState&);
     bool setNodeValue(Node* parentNode, const String& value, ExceptionState&);
 
     bool insertBefore(Node* parentNode, PassRefPtr<Node>, Node* anchorNode, ErrorString*);
     bool removeChild(Node* parentNode, Node*, ErrorString*);
     bool setAttribute(Element*, const String& name, const String& value, ErrorString*);
     bool removeAttribute(Element*, const String& name, ErrorString*);
     bool setOuterHTML(Node*, const String& html, Node** newNode, ErrorString*);
     bool replaceWholeText(Text*, const String& text, ErrorString*);
 
 private:
     class DOMAction;
     class RemoveChildAction;
     class InsertBeforeAction;
     class RemoveAttributeAction;
     class SetAttributeAction;
     class SetOuterHTMLAction;
     class ReplaceWholeTextAction;
     class ReplaceChildNodeAction;
     class SetNodeValueAction;
 
-    InspectorHistory* m_history;
+    RawPtrWillBeMember<InspectorHistory> m_history;
 };
 
 
 } // namespace WebCore
 
 #endif // !defined(DOMEditor_h)