Reviewed by Eric Seidel.

        Make the HTML5 parser actually parse <div></div>
        https://bugs.webkit.org/show_bug.cgi?id=39342

        This patch is covered by every LayoutTest.  Yes.  All of them.  :)

        * html/HTML5Lexer.cpp:
        (WebCore::toLowerCase):
        (WebCore::HTML5Lexer::HTML5Lexer):
        (WebCore::HTML5Lexer::nextToken):
        (WebCore::HTML5Lexer::emitCharacter):
        * html/HTML5Lexer.h:
        * html/HTML5Token.h:
        (WebCore::HTML5Token::HTML5Token):
        (WebCore::HTML5Token::beginStartTag):
        (WebCore::HTML5Token::beginEndTag):
        (WebCore::HTML5Token::appendToName):
        (WebCore::HTML5Token::type):
        (WebCore::HTML5Token::name):
        (WebCore::HTML5Token::selfClosing):
        (WebCore::HTML5Token::attrs):
        * html/HTML5Tokenizer.cpp:
        (WebCore::convertToOldStyle):
        (WebCore::HTML5Tokenizer::write):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@59745 268f45cc-cd09-0410-ab3c-d52691b4dbfc