Add missing tests for LegacyDefaultOptionalArguments for setCustomValidity https://bugs.webkit.org/show_bug.cgi?id=69532
Add missing tests for LegacyDefaultOptionalArguments for setCustomValidity
https://bugs.webkit.org/show_bug.cgi?id=69532

Reviewed by Andreas Kling.

These APIs are relatively new and it's unlikely that many folks will
call them without their argument.  Making the parameters required
aligns WebKit more closely with the specifications for this API at
minimal compatibility cost.

* fast/dom/set-custom-validity-with-too-few-arguments-expected.txt: Added.
* fast/dom/set-custom-validity-with-too-few-arguments.html: Added.


git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@96839 bbb929c8-8fbe-4397-9dbb-9b2b20218538
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