Fix invalid syntax for JS setters in tests

ECMAScript setters require exactly one parameter.
We had a bunch of tests with zero parameters which
is not valid and should have been SyntaxErrors in
the first place.

BUG=383596

Review URL: https://codereview.chromium.org/339363002

git-svn-id: svn://svn.chromium.org/blink/trunk@176451 bbb929c8-8fbe-4397-9dbb-9b2b20218538