Expect JSReceiver in Runtime_DeleteLookupSlot, not just JSObject.

test/mjsunit/mjsunit.status

 # Copyright 2012 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 742 matching lines @@
   'es7/*': [SKIP],
   'strong/*': [SKIP],
   'harmony/*': [SKIP],
   'regress/debug*': [SKIP],
   'regress/regress-debug*': [SKIP],
 
   # TODO(4684): Support for "with" statements is missing.
   'regress/regress-1528': [FAIL],
   'regress/regress-2594': [FAIL],
   'regress/regress-410030': [FAIL],
+  'regress/regress-583260': [FAIL],
   'regress/regress-96523': [FAIL],
   'regress/regress-crbug-505907': [FAIL],
   'regress/regress-crbug-506956': [FAIL],
   'strict-mode-implicit-receiver': [FAIL],
   'throw-and-catch-function': [FAIL],
   'with-leave': [FAIL],
 
   'arguments-load-across-eval': [SKIP],
   'arguments-read-and-assignment': [SKIP],
   'array-constructor': [PASS, SLOW],
@@ skipping 243 matching lines @@
   # Tests taking too long.
   'array-functions-prototype-misc': [SKIP],
   'strong/implicit-conversions': [SKIP],
   'strong/load-element-mutate-backing-store': [SKIP],
 
   # Stack overflow.
   'big-array-literal': [SKIP],
 }],  # 'gcov_coverage'
 
 ]