Fix invalid syntax for JS setters in tests

LayoutTests/fast/js/script-tests/reserved-words-as-property.js

 description("Tests to ensure that we can use ES reserved words as property names.");
 
 var reservedWords = ["true", "false", "null", "break", "case", "catch", "continue", "debugger", "default", "delete", "do", "else", "finally", "for",
                      "function", "if", "in", "instanceof", "new", "return", "switch", "this", "throw", "try", "typeof", "var", "void", "while", "with",
                      "class", "const", "enum", "export", "extends", "import", "super"];
 
 var strictReservedWords = [
     "implements",
     "let",
     "private",
@@ skipping 38 matching lines @@
 function testWord(word, strictPrefix, expectedResult) {
     testWordEvalAndFunction(strictPrefix + "var " + word + "; true", expectedResult);
     testWordEvalAndFunction(strictPrefix + "var " + word + " = 42; " + word + " === 42", expectedResult);
     testWordEvalAndFunction(strictPrefix + "function g(" + word + "){ " + strictPrefix + " }; true", expectedResult);
     testWordEvalAndFunction(strictPrefix + "/" + word + "/.test(function g(" + word + "){ " + strictPrefix + " })", expectedResult);
     testWordEvalAndFunction(strictPrefix + "try{}catch(" + word + "){}; true", expectedResult);
     testWordEvalAndFunction(strictPrefix + "function " + word + "(){ " + strictPrefix + " }; true", expectedResult);
     // These should be allowed for all words, even reserved ones.
     testWordEvalAndFunction(strictPrefix + "({ \"" + word + "\": 42 }." + word + " === 42)", false);
     testWordEvalAndFunction(strictPrefix + "({ " + word + ": 42 }." + word + " === 42)", false);
-    testWordEvalAndFunction(strictPrefix + "({ get " + word + "(){}, set " + word + "(){}, parsedOkay: 42 }.parsedOkay === 42)", false);
+    testWordEvalAndFunction(strictPrefix + "({ get " + word + "(){}, set " + word + "(_){}, parsedOkay: 42 }.parsedOkay === 42)", false);
 }
 
 function testWordStrictAndNonStrict(word, condition) {
     testWord(word, '', condition == "keyword");
     testWord(word, '"use strict";', condition != "identifier");
 }
 
 for (var i = 0; i < reservedWords.length; i++)
     testWordStrictAndNonStrict(reservedWords[i], "keyword");
 for (var i = 0; i < strictReservedWords.length; i++)
     testWordStrictAndNonStrict(strictReservedWords[i], "strict");
 for (var i = 0; i < unreservedWords.length; i++)
     testWordStrictAndNonStrict(unreservedWords[i], "identifier");
 
 // test access via window.
 var yield = 42;
 shouldBeTrue("window.yield === 42");