Reviewed by Eric Seidel.

        Rewrite the test fast/parser/comment-in-textarea to use dumpAsText
        so that the expected results can be independent of platform differences.
        https://bugs.webkit.org/show_bug.cgi?id=31580

        * fast/parser/comment-in-textarea-expected.txt: Added.
        * fast/parser/comment-in-textarea.html:
        * fast/parser/script-tests/comment-in-textarea.js: Added.
        * platform/mac/fast/parser/comment-in-textarea-expected.checksum: Removed.
        * platform/mac/fast/parser/comment-in-textarea-expected.png: Removed.
        * platform/mac/fast/parser/comment-in-textarea-expected.txt: Removed.
        * platform/win/fast/parser/comment-in-textarea-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@51427 268f45cc-cd09-0410-ab3c-d52691b4dbfc