Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/PageDebuggerAgent.h

Index: Source/core/inspector/PageDebuggerAgent.h
diff --git a/Source/core/inspector/PageDebuggerAgent.h b/Source/core/inspector/PageDebuggerAgent.h
index 97f2553dff757d4bbe4cee19986a326d69eff832..e23dd78388b79b1a31bfc72dddf5d84bae10687d 100644
--- a/Source/core/inspector/PageDebuggerAgent.h
+++ b/Source/core/inspector/PageDebuggerAgent.h
@@ -48,10 +48,11 @@ class PageDebuggerAgent FINAL :
     public InspectorDebuggerAgent,
     public InspectorOverlayHost::Listener {
     WTF_MAKE_NONCOPYABLE(PageDebuggerAgent);
-    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED;
 public:
-    static PassOwnPtr<PageDebuggerAgent> create(PageScriptDebugServer*, InspectorPageAgent*, InjectedScriptManager*, InspectorOverlay*);
+    static PassOwnPtrWillBeRawPtr<PageDebuggerAgent> create(PageScriptDebugServer*, InspectorPageAgent*, InjectedScriptManager*, InspectorOverlay*);
     virtual ~PageDebuggerAgent();
+    virtual void trace(Visitor*) OVERRIDE;
 
     void didClearDocumentOfWindowObject(LocalFrame*);
     String preprocessEventListener(LocalFrame*, const String& source, const String& url, const String& functionName);
@@ -78,7 +79,7 @@ private:
 
     PageDebuggerAgent(PageScriptDebugServer*, InspectorPageAgent*, InjectedScriptManager*, InspectorOverlay*);
     PageScriptDebugServer* m_pageScriptDebugServer;
-    InspectorPageAgent* m_pageAgent;
+    RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
     InspectorOverlay* m_overlay;
 };