Make stylesheet owner node a reference instead of pointer.

third_party/WebKit/Source/core/dom/ProcessingInstruction.cpp

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2006, 2008, 2009 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 167 matching lines @@
         return true;
     if (!m_sheet)
         return false;
     return m_sheet->isLoading();
 }
 
 bool ProcessingInstruction::sheetLoaded()
 {
     if (!isLoading()) {
         if (!DocumentXSLT::sheetLoaded(document(), this))
-            document().styleEngine().removePendingSheet(this, m_styleEngineContext);
+            document().styleEngine().removePendingSheet(*this, m_styleEngineContext);
         return true;
     }
     return false;
 }
 
 void ProcessingInstruction::setCSSStyleSheet(const String& href, const KURL& baseURL, const String& charset, const CSSStyleSheetResource* sheet)
 {
     if (!isConnected()) {
         DCHECK(!m_sheet);
         return;
     }
 
     DCHECK(m_isCSS);
     CSSParserContext parserContext(document(), nullptr, baseURL, charset);
 
     StyleSheetContents* newSheet = StyleSheetContents::create(href, parserContext);
 
-    CSSStyleSheet* cssSheet = CSSStyleSheet::create(newSheet, this);
+    CSSStyleSheet* cssSheet = CSSStyleSheet::create(newSheet, *this);
     cssSheet->setDisabled(m_alternate);
     cssSheet->setTitle(m_title);
     if (!m_alternate && !m_title.isEmpty())
         document().styleEngine().setPreferredStylesheetSetNameIfNotSet(m_title, StyleEngine::DontUpdateActiveSheets);
     cssSheet->setMediaQueries(MediaQuerySet::create(m_media));
 
     m_sheet = cssSheet;
 
     // We don't need the cross-origin security check here because we are
     // getting the sheet text in "strict" mode. This enforces a valid CSS MIME
@@ skipping 33 matching lines @@
 Node::InsertionNotificationRequest ProcessingInstruction::insertedInto(ContainerNode* insertionPoint)
 {
     CharacterData::insertedInto(insertionPoint);
     if (!insertionPoint->isConnected())
         return InsertionDone;
 
     String href;
     String charset;
     bool isValid = checkStyleSheet(href, charset);
     if (!DocumentXSLT::processingInstructionInsertedIntoDocument(document(), this))
-        document().styleEngine().addStyleSheetCandidateNode(this);
+        document().styleEngine().addStyleSheetCandidateNode(*this);
     if (isValid)
         process(href, charset);
     return InsertionDone;
 }
 
 void ProcessingInstruction::removedFrom(ContainerNode* insertionPoint)
 {
     CharacterData::removedFrom(insertionPoint);
     if (!insertionPoint->isConnected())
         return;
 
     // No need to remove XSLStyleSheet from StyleEngine.
     if (!DocumentXSLT::processingInstructionRemovedFromDocument(document(), this))
-        document().styleEngine().removeStyleSheetCandidateNode(this);
+        document().styleEngine().removeStyleSheetCandidateNode(*this);
 
     StyleSheet* removedSheet = m_sheet;
     if (m_sheet) {
         DCHECK_EQ(m_sheet->ownerNode(), this);
         clearSheet();
     }
 
     // No need to remove pending sheets.
     clearResource();
 
     // If we're in document teardown, then we don't need to do any notification of our sheet's removal.
     if (document().isActive())
         document().styleEngine().setNeedsActiveStyleUpdate(removedSheet, FullStyleUpdate);
 }
 
 void ProcessingInstruction::clearSheet()
 {
     DCHECK(m_sheet);
     if (m_sheet->isLoading())
-        document().styleEngine().removePendingSheet(this, m_styleEngineContext);
+        document().styleEngine().removePendingSheet(*this, m_styleEngineContext);
     m_sheet.release()->clearOwnerNode();
 }
 
 DEFINE_TRACE(ProcessingInstruction)
 {
     visitor->trace(m_sheet);
     visitor->trace(m_listenerForXSLT);
     CharacterData::trace(visitor);
     ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 } // namespace blink