Move CSSRuleList to the garbage collected heap

Source/core/css/CSSStyleSheet.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 28 matching lines @@
 #include "core/html/HTMLStyleElement.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/svg/SVGStyleElement.h"
 #include "platform/weborigin/SecurityOrigin.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace WebCore {
 
 class StyleSheetCSSRuleList FINAL : public CSSRuleList {
 public:
+    static PassOwnPtrWillBeRawPtr<StyleSheetCSSRuleList> create(CSSStyleSheet* sheet)
+    {
+        return adoptPtrWillBeNoop(new StyleSheetCSSRuleList(sheet));
+    }
+
+    virtual void trace(Visitor* visitor) OVERRIDE
+    {
+        visitor->trace(m_styleSheet);
+    }
+
+private:
     StyleSheetCSSRuleList(CSSStyleSheet* sheet) : m_styleSheet(sheet) { }
 
-private:
+#if !ENABLE(OILPAN)
     virtual void ref() OVERRIDE { m_styleSheet->ref(); }
     virtual void deref() OVERRIDE { m_styleSheet->deref(); }
+#endif
 
     virtual unsigned length() const OVERRIDE { return m_styleSheet->length(); }
     virtual CSSRule* item(unsigned index) const OVERRIDE { return m_styleSheet->item(index); }
 
     virtual CSSStyleSheet* styleSheet() const OVERRIDE { return m_styleSheet; }
 
-    CSSStyleSheet* m_styleSheet;
+    RawPtrWillBeMember<CSSStyleSheet> m_styleSheet;
 };
 
 #if !ASSERT_DISABLED
 static bool isAcceptableCSSStyleSheetParent(Node* parentNode)
 {
     // Only these nodes can be parents of StyleSheets, and they need to call clearOwnerNode() when moved out of document.
     return !parentNode
         || parentNode->isDocumentNode()
         || isHTMLLinkElement(*parentNode)
         || isHTMLStyleElement(*parentNode)
@@ skipping 180 matching lines @@
     if (baseURL.isEmpty())
         return true;
     Document* document = ownerDocument();
     if (!document)
         return true;
     if (document->securityOrigin()->canRequest(baseURL))
         return true;
     return false;
 }
 
-PassRefPtr<CSSRuleList> CSSStyleSheet::rules()
+PassRefPtrWillBeRawPtr<CSSRuleList> CSSStyleSheet::rules()
 {
     if (!canAccessRules())
         return nullptr;
     // IE behavior.
-    RefPtr<StaticCSSRuleList> nonCharsetRules = StaticCSSRuleList::create();
+    RefPtrWillBeRawPtr<StaticCSSRuleList> nonCharsetRules(StaticCSSRuleList::create());
     unsigned ruleCount = length();
     for (unsigned i = 0; i < ruleCount; ++i) {
         CSSRule* rule = item(i);
         if (rule->type() == CSSRule::CHARSET_RULE)
             continue;
         nonCharsetRules->rules().append(rule);
     }
     return nonCharsetRules.release();
 }
 
@@ skipping 65 matching lines @@
     // As per Microsoft documentation, always return -1.
     return -1;
 }
 
 int CSSStyleSheet::addRule(const String& selector, const String& style, ExceptionState& exceptionState)
 {
     return addRule(selector, style, length(), exceptionState);
 }
 
 
-PassRefPtr<CSSRuleList> CSSStyleSheet::cssRules()
+PassRefPtrWillBeRawPtr<CSSRuleList> CSSStyleSheet::cssRules()
 {
     if (!canAccessRules())
         return nullptr;
     if (!m_ruleListCSSOMWrapper)
-        m_ruleListCSSOMWrapper = adoptPtr(new StyleSheetCSSRuleList(this));
+        m_ruleListCSSOMWrapper = StyleSheetCSSRuleList::create(this);
     return m_ruleListCSSOMWrapper.get();
 }
 
 String CSSStyleSheet::href() const
 {
     return m_contents->originalURL();
 }
 
 KURL CSSStyleSheet::baseURL() const
 {
@@ skipping 46 matching lines @@
     m_ownerNode->startLoadingDynamicSheet();
 }
 
 void CSSStyleSheet::trace(Visitor* visitor)
 {
     visitor->trace(m_contents);
     visitor->trace(m_mediaQueries);
     visitor->trace(m_ownerRule);
     visitor->trace(m_mediaCSSOMWrapper);
     visitor->trace(m_childRuleCSSOMWrappers);
+    visitor->trace(m_ruleListCSSOMWrapper);
 }
 
 }