Fix compile-problem in (currently) unused stand-alone preparser function.

src/preparser.h

 // 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
@@ skipping 198 matching lines @@
   Expression ParseRegExpLiteral(bool seen_equal, bool* ok);
   Expression ParseV8Intrinsic(bool* ok);
 
   Arguments ParseArguments(bool* ok);
   Expression ParseFunctionLiteral(bool* ok);
 
   Identifier ParseIdentifier(bool* ok);
   Identifier ParseIdentifierName(bool* ok);
   Identifier ParseIdentifierOrGetOrSet(bool* is_get, bool* is_set, bool* ok);
 
+  // Logs the currently parsed literal as a symbol in the preparser data.
+  void LogSymbol();
+  // Log the currently parsed identifier.
   Identifier GetIdentifierSymbol();
-  unsigned int HexDigitValue(char digit);
+  // Log the currently parsed string literal.
   Expression GetStringSymbol();
 
   i::Token::Value peek() {
     if (stack_overflow_) return i::Token::ILLEGAL;
     return scanner_->peek();
   }
 
   i::Token::Value Next() {
     if (stack_overflow_) return i::Token::ILLEGAL;
     {
@@ skipping 31 matching lines @@
   i::JavaScriptScanner* scanner_;
   i::ParserRecorder* log_;
   Scope* scope_;
   uintptr_t stack_limit_;
   bool stack_overflow_;
   bool allow_lazy_;
 };
 } }  // v8::preparser
 
 #endif  // V8_PREPARSER_H