Demistify DocumentParser::append

Source/core/html/parser/HTMLViewSourceParser.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 30 matching lines @@
     {
         return adoptRefWillBeNoop(new HTMLViewSourceParser(document, mimeType));
     }
     virtual ~HTMLViewSourceParser() { }
 
 private:
     HTMLViewSourceParser(HTMLViewSourceDocument&, const String& mimeType);
 
     // DocumentParser
     virtual void insert(const SegmentedString&) override { ASSERT_NOT_REACHED(); }
-    virtual void append(PassRefPtr<StringImpl>) override;
+    virtual void append(const String&) override;
     virtual void finish() override;
 
     HTMLViewSourceDocument* document() const { return static_cast<HTMLViewSourceDocument*>(DecodedDataDocumentParser::document()); }
 
     void pumpTokenizer();
     void updateTokenizerState();
 
     HTMLInputStream m_input;
     HTMLToken m_token;
     HTMLSourceTracker m_sourceTracker;
     OwnPtr<HTMLTokenizer> m_tokenizer;
     XSSAuditor m_xssAuditor;
 };
 
 }
 
 #endif