Implement for-in loop for proxies.

src/builtins.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 220 matching lines @@
   V(BIT_AND, 1)                          \
   V(BIT_XOR, 1)                          \
   V(UNARY_MINUS, 0)                      \
   V(BIT_NOT, 0)                          \
   V(SHL, 1)                              \
   V(SAR, 1)                              \
   V(SHR, 1)                              \
   V(DELETE, 2)                           \
   V(IN, 1)                               \
   V(INSTANCE_OF, 1)                      \
-  V(GET_KEYS, 0)                         \
   V(FILTER_KEY, 1)                       \
   V(CALL_NON_FUNCTION, 0)                \
   V(CALL_NON_FUNCTION_AS_CONSTRUCTOR, 0) \
   V(CALL_FUNCTION_PROXY, 1)                \
   V(CALL_FUNCTION_PROXY_AS_CONSTRUCTOR, 1) \
   V(TO_OBJECT, 0)                        \
   V(TO_NUMBER, 0)                        \
   V(TO_STRING, 0)                        \
   V(STRING_ADD_LEFT, 1)                  \
   V(STRING_ADD_RIGHT, 1)                 \
@@ skipping 120 matching lines @@
 
   friend class BuiltinFunctionTable;
   friend class Isolate;
 
   DISALLOW_COPY_AND_ASSIGN(Builtins);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_BUILTINS_H_