Remove unused code from the Sky parser system

sky/engine/core/html/parser/BackgroundHTMLParser.h

 /*
  * Copyright (C) 2013 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 32 matching lines @@
 class BackgroundHTMLParser {
     WTF_MAKE_FAST_ALLOCATED;
 public:
     struct Configuration {
         HTMLParserOptions options;
         WeakPtr<HTMLDocumentParser> parser;
     };
 
     static base::WeakPtr<BackgroundHTMLParser> create(PassOwnPtr<Configuration>);
 
-    struct Checkpoint {
-        WeakPtr<HTMLDocumentParser> parser;
-        OwnPtr<HTMLToken> token;
-        OwnPtr<HTMLTokenizer> tokenizer;
-        String unparsedInput;
-    };
-
-    void appendRawBytesFromParserThread(const char* data, int dataLength);
-
     void appendRawBytesFromMainThread(PassOwnPtr<Vector<char> >);
     void flush();
-    void resumeFrom(PassOwnPtr<Checkpoint>);
     void finish();
     void stop();
 
 private:
     explicit BackgroundHTMLParser(PassOwnPtr<Configuration>);
     ~BackgroundHTMLParser();
 
     void appendDecodedBytes(const String&);
     void markEndOfFile();
     void pumpTokenizer();
     void sendTokensToMainThread();
     void updateDocument(const String& decodedData);
     bool updateTokenizerState(const CompactHTMLToken& token);
 
     SegmentedString m_input;
     OwnPtr<HTMLToken> m_token;
     OwnPtr<HTMLTokenizer> m_tokenizer;
-    HTMLParserOptions m_options;
     WeakPtr<HTMLDocumentParser> m_parser;
 
     OwnPtr<CompactHTMLTokenStream> m_pendingTokens;
     OwnPtr<TextResourceDecoder> m_decoder;
 
     base::WeakPtrFactory<BackgroundHTMLParser> m_weakFactory;
 };
 
 }
 
 #endif