Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorHistory.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 InspectorHistory_h
 #define InspectorHistory_h
 
+#include "platform/heap/Handle.h"
 #include "wtf/RefPtr.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
 class ExceptionState;
 
-class InspectorHistory FINAL {
-    WTF_MAKE_NONCOPYABLE(InspectorHistory); WTF_MAKE_FAST_ALLOCATED;
+class InspectorHistory FINAL : public NoBaseWillBeGarbageCollected<InspectorHistory> {
+    WTF_MAKE_NONCOPYABLE(InspectorHistory);
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    class Action : public RefCounted<Action> {
-        WTF_MAKE_FAST_ALLOCATED;
+    class Action : public RefCountedWillBeGarbageCollectedFinalized<Action> {
+        WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
     public:
-        Action(const String& name);
+        explicit Action(const String& name);
         virtual ~Action();
+        virtual void trace(Visitor*);
         virtual String toString();
 
         virtual String mergeId();
-        virtual void merge(PassRefPtr<Action>);
+        virtual void merge(PassRefPtrWillBeRawPtr<Action>);
 
         virtual bool perform(ExceptionState&) = 0;
 
         virtual bool undo(ExceptionState&) = 0;
         virtual bool redo(ExceptionState&) = 0;
 
         virtual bool isUndoableStateMark();
     private:
         String m_name;
     };
 
     InspectorHistory();
+    void trace(Visitor*);
 
-    bool perform(PassRefPtr<Action>, ExceptionState&);
+    bool perform(PassRefPtrWillBeRawPtr<Action>, ExceptionState&);
     void markUndoableState();
 
     bool undo(ExceptionState&);
     bool redo(ExceptionState&);
     void reset();
 
 private:
-    Vector<RefPtr<Action> > m_history;
+    WillBeHeapVector<RefPtrWillBeMember<Action> > m_history;
     size_t m_afterLastActionIndex;
 };
 
 
 } // namespace WebCore
 
 #endif // !defined(InspectorHistory_h)