Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/PageRuntimeAgent.cpp

Index: Source/core/inspector/PageRuntimeAgent.cpp
diff --git a/Source/core/inspector/PageRuntimeAgent.cpp b/Source/core/inspector/PageRuntimeAgent.cpp
index 435cfb8b8bacb87e6a7c84f89256366a8e17901a..7ed6f69f9743a9cc1172ca2e2ad61907e0545051 100644
--- a/Source/core/inspector/PageRuntimeAgent.cpp
+++ b/Source/core/inspector/PageRuntimeAgent.cpp
@@ -55,7 +55,15 @@ PageRuntimeAgent::PageRuntimeAgent(InjectedScriptManager* injectedScriptManager,
 
 PageRuntimeAgent::~PageRuntimeAgent()
 {
+#if !ENABLE(OILPAN)
     m_instrumentingAgents->setPageRuntimeAgent(0);
+#endif
+}
+
+void PageRuntimeAgent::trace(Visitor* visitor)
+{
+    visitor->trace(m_pageAgent);
+    InspectorRuntimeAgent::trace(visitor);
 }
 
 void PageRuntimeAgent::init()