Make stylesheet owner node a reference instead of pointer.

third_party/WebKit/Source/core/dom/StyleEngine.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
@@ skipping 67 matching lines @@
     ~StyleEngine();
 
     const HeapVector<Member<StyleSheet>>& styleSheetsForStyleSheetList(TreeScope&);
 
     const HeapVector<Member<CSSStyleSheet>>& injectedAuthorStyleSheets() const { return m_injectedAuthorStyleSheets; }
     CSSStyleSheet* inspectorStyleSheet() const { return m_inspectorStyleSheet; }
 
     const HeapVector<Member<CSSStyleSheet>> activeStyleSheetsForInspector() const;
 
     void setNeedsActiveStyleUpdate(StyleSheet*, StyleResolverUpdateMode);
-    void addStyleSheetCandidateNode(Node*);
-    void removeStyleSheetCandidateNode(Node*);
-    void removeStyleSheetCandidateNode(Node*, TreeScope&);
-    void modifiedStyleSheetCandidateNode(Node*);
+    void addStyleSheetCandidateNode(Node&);
+    void removeStyleSheetCandidateNode(Node&);
+    void removeStyleSheetCandidateNode(Node&, TreeScope&);
+    void modifiedStyleSheetCandidateNode(Node&);
     void watchedSelectorsChanged();
 
     void injectAuthorSheet(StyleSheetContents* authorSheet);
     CSSStyleSheet& ensureInspectorStyleSheet();
 
     void clearMediaQueryRuleSetStyleSheets();
     void updateStyleSheetsInImport(DocumentStyleSheetCollector& parentCollector);
     void updateActiveStyleSheets(StyleResolverUpdateMode);
 
     enum ActiveSheetsUpdate { DontUpdateActiveSheets, UpdateActiveSheets };
     String preferredStylesheetSetName() const { return m_preferredStylesheetSetName; }
     String selectedStylesheetSetName() const { return m_selectedStylesheetSetName; }
     void setPreferredStylesheetSetNameIfNotSet(const String&, ActiveSheetsUpdate);
     void setSelectedStylesheetSetName(const String&);
     void setHttpDefaultStyle(const String&);
 
     void addPendingSheet(StyleEngineContext&);
-    void removePendingSheet(Node* styleSheetCandidateNode, const StyleEngineContext&);
+    void removePendingSheet(Node& styleSheetCandidateNode, const StyleEngineContext&);
 
     bool hasPendingScriptBlockingSheets() const { return m_pendingScriptBlockingStylesheets > 0; }
     bool hasPendingRenderBlockingSheets() const { return m_pendingRenderBlockingStylesheets > 0; }
     bool haveScriptBlockingStylesheetsLoaded() const { return !hasPendingScriptBlockingSheets() || m_ignorePendingStylesheets; }
     bool haveRenderBlockingStylesheetsLoaded() const { return !hasPendingRenderBlockingSheets() || m_ignorePendingStylesheets; }
     bool ignoringPendingStylesheets() const { return m_ignorePendingStylesheets; }
 
     unsigned maxDirectAdjacentSelectors() const { return m_maxDirectAdjacentSelectors; }
     bool usesSiblingRules() const { return m_usesSiblingRules; }
     bool usesFirstLineRules() const { return m_usesFirstLineRules; }
@@ skipping 37 matching lines @@
 
     void removeFontFaceRules(const HeapVector<Member<const StyleRuleFontFace>>&);
     void clearFontCache();
     // updateGenericFontFamilySettings is used from WebSettingsImpl.
     void updateGenericFontFamilySettings();
 
     void didDetach();
     bool shouldClearResolver() const;
     void resolverChanged(StyleResolverUpdateMode);
 
-    CSSStyleSheet* createSheet(Element*, const String& text, TextPosition startPosition, StyleEngineContext&);
+    CSSStyleSheet* createSheet(Element&, const String& text, TextPosition startPosition, StyleEngineContext&);
 
     void collectScopedStyleFeaturesTo(RuleFeatureSet&) const;
     void ensureFullscreenUAStyle();
 
     void platformColorsChanged();
 
     void classChangedForElement(const SpaceSplitString& changedClasses, Element&);
     void classChangedForElement(const SpaceSplitString& oldClasses, const SpaceSplitString& newClasses, Element&);
     void attributeChangedForElement(const QualifiedName& attributeName, Element&);
     void idChangedForElement(const AtomicString& oldId, const AtomicString& newId, Element&);
@@ skipping 31 matching lines @@
     bool isMaster() const { return m_isMaster; }
     Document* master();
     Document& document() const { return *m_document; }
 
     typedef HeapHashSet<Member<TreeScope>> UnorderedTreeScopeSet;
 
     void clearMediaQueryRuleSetOnTreeScopeStyleSheets(UnorderedTreeScopeSet&);
 
     void createResolver();
 
-    static CSSStyleSheet* parseSheet(Element*, const String& text, TextPosition startPosition);
+    CSSStyleSheet* parseSheet(Element&, const String& text, TextPosition startPosition);
 
     const DocumentStyleSheetCollection* documentStyleSheetCollection() const
     {
         return m_documentStyleSheetCollection.get();
     }
 
     DocumentStyleSheetCollection* documentStyleSheetCollection()
     {
         return m_documentStyleSheetCollection.get();
     }
@@ skipping 47 matching lines @@
 
     std::unique_ptr<StyleResolverStats> m_styleResolverStats;
     unsigned m_styleForElementCount = 0;
 
     friend class StyleEngineTest;
 };
 
 } // namespace blink
 
 #endif