Remove unused variable from Scanner class.

src/scanner.h

-// Copyright 2006-2008 the V8 project authors. All rights reserved.
+// Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
 //       with the distribution.
@@ skipping 262 matching lines @@
    public:
     explicit LiteralScope(Scanner* self);
     ~LiteralScope();
     void Complete();
 
    private:
     Scanner* scanner_;
     bool complete_;
   };
 
-  // Construction
-  explicit Scanner(ParserMode parse_mode);
+  Scanner();
 
   // Initialize the Scanner to scan source.
   void Initialize(Handle<String> source,
                   ParserLanguage language);
   void Initialize(Handle<String> source,
                   unibrow::CharacterStream* stream,
                   ParserLanguage language);
   void Initialize(Handle<String> source,
                   int start_position, int end_position,
                   ParserLanguage language);
@@ skipping 185 matching lines @@
     return source_->pos() - kCharacterLookaheadBufferSize;
   }
 
   // Decodes a unicode escape-sequence which is part of an identifier.
   // If the escape sequence cannot be decoded the result is kBadRune.
   uc32 ScanIdentifierUnicodeEscape();
 
   TokenDesc current_;  // desc for current token (as returned by Next())
   TokenDesc next_;     // desc for next token (one token look-ahead)
   bool has_line_terminator_before_next_;
-  bool is_pre_parsing_;
   bool is_parsing_json_;
 
   // Different UTF16 buffers used to pull characters from. Based on input one of
   // these will be initialized as the actual data source.
   CharacterStreamUTF16Buffer char_stream_buffer_;
   ExternalStringUTF16Buffer<ExternalTwoByteString, uint16_t>
       two_byte_string_buffer_;
   ExternalStringUTF16Buffer<ExternalAsciiString, char> ascii_string_buffer_;
 
   // Source. Will point to one of the buffers declared above.
@@ skipping 10 matching lines @@
   bool stack_overflow_;
   static StaticResource<Utf8Decoder> utf8_decoder_;
 
   // One Unicode character look-ahead; c0_ < 0 at the end of the input.
   uc32 c0_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_H_