Make CSSParserContext be garbage collected.

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 177 matching lines @@
     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);
+  CSSParserContext* parserContext =
+      CSSParserContext::create(document(), baseURL, charset);
 
   StyleSheetContents* newSheet =
       StyleSheetContents::create(href, parserContext);
 
   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);
   cssSheet->setMediaQueries(MediaQuerySet::create(m_media));
@@ skipping 82 matching lines @@
 }
 
 DEFINE_TRACE(ProcessingInstruction) {
   visitor->trace(m_sheet);
   visitor->trace(m_listenerForXSLT);
   CharacterData::trace(visitor);
   ResourceOwner<StyleSheetResource>::trace(visitor);
 }
 
 }  // namespace blink