Demistify DocumentParser::append

Source/core/xml/parser/XMLDocumentParser.h

 /*
  * Copyright (C) 2000 Peter Kelly (pmk@post.com)
  * Copyright (C) 2005, 2006, 2007 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Samuel Weinig (sam@webkit.org)
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  *
  * 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
@@ skipping 90 matching lines @@
         virtual ~PendingCallback() { }
         virtual void call(XMLDocumentParser*) = 0;
     };
 
 private:
     explicit XMLDocumentParser(Document&, FrameView* = 0);
     XMLDocumentParser(DocumentFragment*, Element*, ParserContentPolicy);
 
     // From DocumentParser
     virtual void insert(const SegmentedString&) override;
-    virtual void append(PassRefPtr<StringImpl>) override;
+    virtual void append(const String&) override;
     virtual void finish() override;
     virtual bool isWaitingForScripts() const override;
     virtual void stopParsing() override;
     virtual void detach() override;
     virtual OrdinalNumber lineNumber() const override;
     OrdinalNumber columnNumber() const;
 
     // from ResourceClient
     virtual void notifyFinished(Resource*) override;
 
@@ skipping 70 matching lines @@
     PrefixForNamespaceMap m_prefixToNamespaceMap;
     SegmentedString m_pendingSrc;
 };
 
 xmlDocPtr xmlDocPtrForString(ResourceFetcher*, const String& source, const String& url);
 HashMap<String, String> parseAttributes(const String&, bool& attrsOK);
 
 } // namespace blink
 
 #endif // XMLDocumentParser_h