Use Testharness.js for the MathML script tests

Use Testharness.js for the MathML script tests
https://bugs.webkit.org/show_bug.cgi?id=154065

Reviewed by Darin Adler.

* mathml/opentype/large-operators-munderover-expected.txt:
* mathml/opentype/large-operators-munderover.html:
* mathml/presentation/inferred-mrow-baseline-expected.txt:
* mathml/presentation/inferred-mrow-baseline.html:
* mathml/presentation/inferred-mrow-stretchy-expected.txt:
* mathml/presentation/inferred-mrow-stretchy.html:
* mathml/presentation/stretchy-depth-height-expected.txt:
* mathml/presentation/stretchy-depth-height-symmetric-expected.txt:
* mathml/presentation/stretchy-depth-height-symmetric.html:
* mathml/presentation/stretchy-depth-height.html:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@196417 268f45cc-cd09-0410-ab3c-d52691b4dbfc