Don't let JSON parsed objects hit inherited setters.

src/parser.cc

 // 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 3654 matching lines @@
         return ReportUnexpectedToken();
       }
       Handle<String> key = GetString();
       if (scanner_.Next() != Token::COLON) {
         return ReportUnexpectedToken();
       }
       Handle<Object> value = ParseJsonValue();
       if (value.is_null()) return Handle<Object>::null();
       uint32_t index;
       if (key->AsArrayIndex(&index)) {
-        SetElement(json_object, index, value);
+        CALL_HEAP_FUNCTION_INLINE(
+            (*json_object)->SetElement(index, *value, true));
       } else {
-        SetProperty(json_object, key, value, NONE);
+        CALL_HEAP_FUNCTION_INLINE(
+            (*json_object)->SetPropertyPostInterceptor(*key, *value, NONE));
       }
     } while (scanner_.Next() == Token::COMMA);
     if (scanner_.current_token() != Token::RBRACE) {
       return ReportUnexpectedToken();
     }
   }
   return json_object;
 }
 
 
@@ skipping 1010 matching lines @@
       Handle<String> source = Handle<String>(String::cast(script->source()));
       result = parser.ParseProgram(source, info->is_global());
     }
   }
 
   info->SetFunction(result);
   return (result != NULL);
 }
 
 } }  // namespace v8::internal