Revert "Pass undefined to JS builtins when called with implicit receiver."

test/mozilla/mozilla.status

 # Copyright 2009 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 188 matching lines @@
 
 # Test that assumes specific runtime for a regexp, flaky in debug mode.
 ecma_3/RegExp/regress-85721: PASS || FAIL if $mode == debug
 
 
 ##################### INCOMPATIBLE TESTS #####################
 
 # This section is for tests that fail in both V8 and JSC.  Thus they
 # have been determined to be incompatible between Mozilla and V8/JSC.
 
-# Fail because it calls builtins as functions and do not expect the
-# builtin to have undefined as the receiver.
-ecma/String/15.5.4.6-2: FAIL_OK
-
 # Fail because of toLowerCase and toUpperCase conversion.
 ecma/String/15.5.4.11-2: FAIL_OK
 ecma/String/15.5.4.11-5: FAIL_OK
 ecma/String/15.5.4.12-1: FAIL_OK
 ecma/String/15.5.4.12-4: FAIL_OK
 
 # This test uses an older version of the unicode standard that fails
 # us because we correctly convert the armenian small ligature ech-yiwn
 # to the two upper-case characters ECH and YIWN, whereas the older
 # unicode version converts it to itself.
@@ skipping 651 matching lines @@
 ecma/Date/15.9.5.12-2: SKIP
 ecma/Date/15.9.5.8: SKIP
 ecma/Date/15.9.5.9: SKIP
 ecma/Date/15.9.5.11-2: SKIP
 ecma/Expressions/11.7.2: SKIP
 ecma/Expressions/11.10-2: SKIP
 ecma/Expressions/11.7.3: SKIP
 ecma/Expressions/11.10-3: SKIP
 ecma/Expressions/11.7.1: SKIP
 ecma_3/RegExp/regress-209067: SKIP