Demistify DocumentParser::append

Source/core/html/parser/HTMLDocumentParser.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 93 matching lines @@
     void didReceiveEncodingDataFromBackgroundParser(const DocumentEncodingData&);
 
     virtual void appendBytes(const char* bytes, size_t length) override;
     virtual void flush() override final;
     virtual void setDecoder(PassOwnPtr<TextResourceDecoder>) override final;
 
     UseCounter* useCounter() { return UseCounter::getFrom(contextForParsingSession()); }
 
 protected:
     virtual void insert(const SegmentedString&) override final;
-    virtual void append(PassRefPtr<StringImpl>) override;
+    virtual void append(const String&) override;
     virtual void finish() override final;
 
     HTMLDocumentParser(HTMLDocument&, bool reportErrors, ParserSynchronizationPolicy);
     HTMLDocumentParser(DocumentFragment*, Element* contextElement, ParserContentPolicy);
 
     HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
 
     void forcePlaintextForTextDocument();
 
 private:
@@ skipping 78 matching lines @@
     bool m_haveBackgroundParser;
     bool m_tasksWereSuspended;
     unsigned m_pumpSessionNestingLevel;
     unsigned m_pumpSpeculationsSessionNestingLevel;
     bool m_isParsingAtLineNumber;
 };
 
 }
 
 #endif