Reviewed by Shinichiro Hamaji.

        Merge ValidityState-stepMismatch-{number,range,unsupported}.html and
        input-step-{number,range,unsupported}.html to other tests
        https://bugs.webkit.org/show_bug.cgi?id=35435

        - Merge ValidityState-stepMismatch-{number,range,unsupported}.html to
        ValidityState-stepMismatch.html
        - Merge input-step--{number,range,unsupported}.html to input-step.html

        * fast/forms/ValidityState-stepMismatch-expected.txt:
        * fast/forms/ValidityState-stepMismatch-number-expected.txt: Removed.
        * fast/forms/ValidityState-stepMismatch-number.html: Removed.
        * fast/forms/ValidityState-stepMismatch-range-expected.txt: Removed.
        * fast/forms/ValidityState-stepMismatch-range.html: Removed.
        * fast/forms/ValidityState-stepMismatch-unsupported-expected.txt: Removed.
        * fast/forms/ValidityState-stepMismatch-unsupported.html: Removed.
        * fast/forms/input-step-number-expected.txt: Removed.
        * fast/forms/input-step-number.html: Removed.
        * fast/forms/input-step-range-expected.txt: Removed.
        * fast/forms/input-step-range.html: Removed.
        * fast/forms/input-step-unsupported-expected.txt: Removed.
        * fast/forms/input-step-unsupported.html: Removed.
        * fast/forms/input-stepup-stepdown-expected.txt:
        * fast/forms/script-tests/ValidityState-stepMismatch-number.js: Removed.
        * fast/forms/script-tests/ValidityState-stepMismatch-range.js: Removed.
        * fast/forms/script-tests/ValidityState-stepMismatch-unsupported.js: Removed.
        * fast/forms/script-tests/ValidityState-stepMismatch.js:
        * fast/forms/script-tests/input-step-number.js: Removed.
        * fast/forms/script-tests/input-step-range.js: Removed.
        * fast/forms/script-tests/input-step-unsupported.js: Removed.
        * fast/forms/script-tests/input-stepup-stepdown.js:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@55423 268f45cc-cd09-0410-ab3c-d52691b4dbfc