Reviewed by Kent Tamura.

        Expectation of /editing/spelling/spelling-textarea.html is confusing
        https://bugs.webkit.org/show_bug.cgi?id=48818

        - Turned spelling-contenteditable.html and spelling-textarea.html into
          single script-test named spelling-hasspellingmarker.html,
          which uses shouldBe() family for the assertion. The original tests
          misused testPassed() for printing.
        - Added a test for <input>, which possibly goes different path from
          editing <textarea> and @contentEditable.
        - Added a "false" case test to catch the error that results true for anything.

        * editing/spelling/script-tests/spelling-hasspellingmarker.js: Added.
        * editing/spelling/spelling-contenteditable-expected.txt: Removed.
        * editing/spelling/spelling-contenteditable.html: Removed.
        * editing/spelling/spelling-hasspellingmarker-expected.txt: Added.
        * editing/spelling/spelling-hasspellingmarker.html: Added.
        * editing/spelling/spelling-textarea-expected.txt: Removed.
        * editing/spelling/spelling-textarea.html: Removed.
        * platform/chromium/test_expectations.txt:
        * platform/gtk/Skipped:
        * platform/qt/Skipped:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@71392 268f45cc-cd09-0410-ab3c-d52691b4dbfc