able to work properly even when whitespace or comment nodes are present.

        Reviewed by aroben

        fast/table/rowindex-comment-nodes.html

        * html/HTMLTableRowElement.cpp:
        (WebCore::HTMLTableRowElement::rowIndex):
        (WebCore::HTMLTableRowElement::insertCell):
        (WebCore::HTMLTableRowElement::deleteCell):
        * html/HTMLTableSectionElement.cpp:
        (WebCore::HTMLTableSectionElement::insertRow):
        (WebCore::HTMLTableSectionElement::deleteRow):



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@21698 268f45cc-cd09-0410-ab3c-d52691b4dbfc