Reviewed by Alexey Proskuryakov.

        http://bugs.webkit.org/show_bug.cgi?id=25487

        For euc-kr and other 8bit Korean encodings
        (similar to euc-kr/windows-949), make document.charset return
        EUC-KR instead of windows-949. The latter is not recognized by
        Korean web servers.

        Add domName method to TextEncoding to deal with cases where
        our internal encoding name does not match what's widely recognized
        by web servers. Currently, the only case is 'windows-949' (internal
        name) vs 'EUC-KR'.

        Test: fast/encoding/euckr-name.html

        * dom/Document.cpp:
        (WebCore::Document::encoding): Call TextEncoding.domName() instead
        of TextEncoding.name().
        * platform/text/TextEncoding.cpp:
        (WebCore::TextEncoding::domName): For the canonical name 'windows-949',
        return 'EUC-KR'. Otherwise, just return the canonical name.
        * platform/text/TextEncoding.h:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@43279 268f45cc-cd09-0410-ab3c-d52691b4dbfc