Remove dynamic cast from DocumentPaser interface

sky/engine/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 60 matching lines @@
     void resumeParsingAfterYield();
 
     TextPosition textPosition() const;
     OrdinalNumber lineNumber() const;
 
     struct ParsedChunk {
         OwnPtr<CompactHTMLTokenStream> tokens;
     };
     void didReceiveParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
 
-    bool isWaitingForScripts() const;
-    bool isExecutingScript() const;
-    void executeScriptsWaitingForResources();
+    // From DocumentParser:
+    void detach() override final;
+    void prepareToStopParsing() override final;
+    void stopParsing() override final;
+    bool isWaitingForScripts() const override final;
+    bool isExecutingScript() const override final;
+    void executeScriptsWaitingForResources() override final;
 
     UseCounter* useCounter() { return UseCounter::getFrom(contextForParsingSession()); }
 
 private:
     HTMLDocumentParser(HTMLDocument&, bool reportErrors);
 
     HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
 
-    virtual HTMLDocumentParser* asHTMLDocumentParser() override final { return this; }
-
-    // DocumentParser
-    virtual void detach() override final;
-    virtual bool processingData() const override final;
-    virtual void prepareToStopParsing() override final;
-    virtual void stopParsing() override final;
-
     bool hasInsertionPoint();
 
     void startBackgroundParser();
     void stopBackgroundParser();
     void validateSpeculations(PassOwnPtr<ParsedChunk> lastChunk);
     void processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
     void pumpPendingSpeculations();
 
     Document* contextForParsingSession();
 
@@ skipping 25 matching lines @@
 
     bool m_isFragment;
     bool m_endWasDelayed;
     bool m_haveBackgroundParser;
     unsigned m_pumpSessionNestingLevel;
 };
 
 }
 
 #endif