Rolling out fix for <rdar://problem/4097849> because the following layout...

    Rolling out fix for <rdar://problem/4097849> because the following layout tests were failing:

        fast/css/namespaces/001
        fast/css/namespaces/002
        fast/css/namespaces/004
        fast/css/namespaces/005
        fast/css/namespaces/006
        fast/overflow/003

        * khtml/html/html_documentimpl.cpp:
        * khtml/html/html_documentimpl.h:
        * khtml/html/html_elementimpl.cpp:
        (HTMLElementImpl::namespaceURI):
        * khtml/xml/dom_docimpl.cpp:
        (DocumentImpl::importNode):
        (DocumentImpl::createElementNS):
        (DocumentImpl::createHTMLElement):
        (DocumentImpl::attrId):
        (DocumentImpl::tagId):
        * khtml/xml/dom_docimpl.h:

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@9075 268f45cc-cd09-0410-ab3c-d52691b4dbfc