Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InjectedScriptHost.cpp

Index: Source/core/inspector/InjectedScriptHost.cpp
diff --git a/Source/core/inspector/InjectedScriptHost.cpp b/Source/core/inspector/InjectedScriptHost.cpp
index 37092364360f494a9c5c7689dffaa3d84392f74e..14650d41a6ca32470cb9f110c1e8e64aeeb5b415 100644
--- a/Source/core/inspector/InjectedScriptHost.cpp
+++ b/Source/core/inspector/InjectedScriptHost.cpp
@@ -45,13 +45,13 @@ 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);
@@ -62,9 +62,14 @@ InjectedScriptHost::~InjectedScriptHost()
 {
 }
 
+void InjectedScriptHost::trace(Visitor* visitor)
+{
+    visitor->trace(m_instrumentingAgents);
+}
+
 void InjectedScriptHost::disconnect()
 {
-    m_instrumentingAgents = 0;
+    m_instrumentingAgents = nullptr;
     m_scriptDebugServer = 0;
 }