Tried using CrossThreadPersistent for workerDebuggerAgents

Source/core/inspector/InspectorStyleSheet.h

Index: Source/core/inspector/InspectorStyleSheet.h
diff --git a/Source/core/inspector/InspectorStyleSheet.h b/Source/core/inspector/InspectorStyleSheet.h
index 63b343ab28ceadc09caa9e272967c467b8ea1791..ef453faae3cbe8627c5da5b01f1596afbbf90e3a 100644
--- a/Source/core/inspector/InspectorStyleSheet.h
+++ b/Source/core/inspector/InspectorStyleSheet.h
@@ -52,7 +52,7 @@ class InspectorPageAgent;
 class InspectorResourceAgent;
 class InspectorStyleSheetBase;
 
-typedef WillBePersistentHeapVector<RefPtrWillBeMember<CSSRule> > CSSRuleVector;
+typedef WillBeHeapVector<RefPtrWillBeMember<CSSRule> > CSSRuleVector;
 typedef String ErrorString;
 
 class InspectorCSSId {
@@ -140,7 +140,7 @@ private:
     mutable bool m_formatAcquired;
 };
 
-class InspectorStyleSheetBase : public RefCounted<InspectorStyleSheetBase> {
+class InspectorStyleSheetBase : public RefCountedWillBeGarbageCollectedFinalized<InspectorStyleSheetBase> {
 public:
     class Listener {
     public:
@@ -151,6 +151,7 @@ public:
         virtual void didReparseStyleSheet() = 0;
     };
     virtual ~InspectorStyleSheetBase() { }
+    virtual void trace(Visitor*) { }
 
     String id() const { return m_id; }
 
@@ -192,9 +193,10 @@ private:
 
 class InspectorStyleSheet : public InspectorStyleSheetBase {
 public:
-    static PassRefPtr<InspectorStyleSheet> create(InspectorPageAgent*, InspectorResourceAgent*, const String& id, PassRefPtrWillBeRawPtr<CSSStyleSheet> pageStyleSheet, TypeBuilder::CSS::StyleSheetOrigin::Enum, const String& documentURL, Listener*);
+    static PassRefPtrWillBeRawPtr<InspectorStyleSheet> create(InspectorPageAgent*, InspectorResourceAgent*, const String& id, PassRefPtrWillBeRawPtr<CSSStyleSheet> pageStyleSheet, TypeBuilder::CSS::StyleSheetOrigin::Enum, const String& documentURL, Listener*);
 
     virtual ~InspectorStyleSheet();
+    virtual void trace(Visitor*) OVERRIDE;
 
     String finalURL() const;
     virtual Document* ownerDocument() const OVERRIDE;
@@ -247,9 +249,9 @@ private:
     bool hasSourceURL() const;
     bool startsAtZero() const;
 
-    InspectorPageAgent* m_pageAgent;
-    InspectorResourceAgent* m_resourceAgent;
-    RefPtrWillBePersistent<CSSStyleSheet> m_pageStyleSheet;
+    RawPtrWillBeMember<InspectorPageAgent> m_pageAgent;
+    RawPtrWillBeMember<InspectorResourceAgent> m_resourceAgent;
+    RefPtrWillBeMember<CSSStyleSheet> m_pageStyleSheet;
     TypeBuilder::CSS::StyleSheetOrigin::Enum m_origin;
     String m_documentURL;
     OwnPtr<ParsedStyleSheet> m_parsedStyleSheet;
@@ -259,7 +261,7 @@ private:
 
 class InspectorStyleSheetForInlineStyle FINAL : public InspectorStyleSheetBase {
 public:
-    static PassRefPtr<InspectorStyleSheetForInlineStyle> create(const String& id, PassRefPtr<Element>, Listener*);
+    static PassRefPtrWillBeRawPtr<InspectorStyleSheetForInlineStyle> create(const String& id, PassRefPtr<Element>, Listener*);
 
     void didModifyElementAttribute();
     virtual Document* ownerDocument() const OVERRIDE;
@@ -270,6 +272,8 @@ public:
     virtual InspectorCSSId styleId(CSSStyleDeclaration* style) const OVERRIDE { return InspectorCSSId(id(), 0); }
     virtual bool setStyleText(const InspectorCSSId&, const String&) OVERRIDE;
 
+    virtual void trace(Visitor*) OVERRIDE;
+
 protected:
     virtual PassRefPtr<InspectorStyle> inspectorStyleForId(const InspectorCSSId&) OVERRIDE;
     virtual unsigned ruleCount() OVERRIDE { return 1; }
@@ -285,7 +289,7 @@ private:
     PassRefPtrWillBeRawPtr<CSSRuleSourceData> getStyleAttributeData() const;
 
     RefPtr<Element> m_element;
-    RefPtrWillBePersistent<CSSRuleSourceData> m_ruleSourceData;
+    RefPtrWillBeMember<CSSRuleSourceData> m_ruleSourceData;
     RefPtr<InspectorStyle> m_inspectorStyle;
 
     // Contains "style" attribute value.