Reviewed by Adam Barth.

        Add new popUntilPopped functions to clean up code
        https://bugs.webkit.org/show_bug.cgi?id=41936

        Pretty self explanatory.  Much awesome code reduction.

        No functional changes, thus no tests.

        * html/HTMLElementStack.cpp:
        (WebCore::HTMLElementStack::popUntilPopped):
        * html/HTMLElementStack.h:
        * html/HTMLTreeBuilder.cpp:
        (WebCore::HTMLTreeBuilder::processAnyOtherEndTagForInBody):
        (WebCore::HTMLTreeBuilder::callTheAdoptionAgency):
        (WebCore::HTMLTreeBuilder::processEndTagForInBody):
        (WebCore::HTMLTreeBuilder::processCaptionEndTagForInCaption):
        (WebCore::HTMLTreeBuilder::processTableEndTagForInTable):
        (WebCore::HTMLTreeBuilder::processEndTag):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@62909 268f45cc-cd09-0410-ab3c-d52691b4dbfc