Make "native" not a keyword.

src/scanner-base.cc

 // 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 879 matching lines @@
       if (MatchKeywordStart(input, "import", 3,
          Token::FUTURE_RESERVED_WORD)) return;
       break;
     case IN:
       token_ = Token::IDENTIFIER;
       if (MatchKeywordStart(input, "interface", 2,
          Token::FUTURE_RESERVED_WORD)) return;
       if (MatchKeywordStart(input, "instanceof", 2, Token::INSTANCEOF)) return;
       break;
     case N:
-      if (MatchKeywordStart(input, "native", 1, Token::NATIVE)) return;
       if (MatchKeywordStart(input, "new", 1, Token::NEW)) return;
       if (MatchKeywordStart(input, "null", 1, Token::NULL_LITERAL)) return;
       break;
     case P:
       if (MatchKeywordStart(input, "package", 1,
           Token::FUTURE_RESERVED_WORD)) return;
       if (MatchState(input, 'r', PR)) return;
       if (MatchKeywordStart(input, "public", 1,
           Token::FUTURE_RESERVED_WORD)) return;
       break;
@@ skipping 33 matching lines @@
       if (MatchKeywordStart(input, "with", 1, Token::WITH)) return;
       break;
     case UNMATCHABLE:
       break;
   }
   // On fallthrough, it's a failure.
   state_ = UNMATCHABLE;
 }
 
 } }  // namespace v8::internal