Cleanup scanner character streams.

src/scanner-character-streams.h

 // Copyright 2011 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
@@ skipping 54 matching lines @@
   GenericStringUtf16CharacterStream(Handle<String> data,
                                     unsigned start_position,
                                     unsigned end_position);
   virtual ~GenericStringUtf16CharacterStream();
 
  protected:
   virtual unsigned BufferSeekForward(unsigned delta);
   virtual unsigned FillBuffer(unsigned position, unsigned length);
 
   Handle<String> string_;
-  unsigned start_position_;
   unsigned length_;
 };
 
 
 // Utf16 stream based on a literal UTF-8 string.
 class Utf8ToUtf16CharacterStream: public BufferedUtf16CharacterStream {
  public:
   Utf8ToUtf16CharacterStream(const byte* data, unsigned length);
   virtual ~Utf8ToUtf16CharacterStream();
 
@@ skipping 34 matching lines @@
     // Entire string is read at start.
     return false;
   }
   Handle<ExternalTwoByteString> source_;
   const uc16* raw_data_;  // Pointer to the actual array of characters.
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_SCANNER_CHARACTER_STREAMS_H_