Reviewed by Tony Chang.

        Text test conversion: editing/spelling/spelling-linebreak.html
        https://bugs.webkit.org/show_bug.cgi?id=47649

        Rewrote verification part using hasSpellingMarker().

        * editing/spelling/spelling-linebreak-expected.txt: Added.
        * editing/spelling/spelling-linebreak.html:
        * platform/gtk/editing/spelling/spelling-linebreak-expected.txt: Removed.
        * platform/mac/editing/spelling/spelling-linebreak-expected.checksum: Removed.
        * platform/mac/editing/spelling/spelling-linebreak-expected.png: Removed.
        * platform/mac/editing/spelling/spelling-linebreak-expected.txt: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@70429 268f45cc-cd09-0410-ab3c-d52691b4dbfc