Reviewed by Ojan Vafai.

        Adopting an iframe to a child frame results in stack overflow
        https://bugs.webkit.org/show_bug.cgi?id=52018

        Throws an exception when a document adopts an iframe that is an ancestor
        of the document in the frame hierarchy. New behavior matches that of Firefox.

        Test: fast/html/adopt-parent-frame.html

        * dom/Document.cpp:
        (WebCore::Document::adoptNode):
2011-01-07  Ryosuke Niwa  <rniwa@webkit.org>

        Reviewed by Ojan Vafai.

        Adopting an iframe to a child frame results in stack overflow
        https://bugs.webkit.org/show_bug.cgi?id=52018

        Added a test to ensure calling adoptNode with an iframe throws an exception
        if the adoptee is an ancestor of the document adopting the node in the frame hierarchy.

        * fast/html/adopt-parent-frame-expected.txt: Added.
        * fast/html/adopt-parent-frame.html: Added.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@75293 268f45cc-cd09-0410-ab3c-d52691b4dbfc