Fixed DOM traversal using NodeRenderingTraversal::parent().
Fixed DOM traversal using NodeRenderingTraversal::parent().

This fix was accidentally dropped from
https://codereview.chromium.org/402603005/

R=esprehn@chromium.org,rbyers@chromium.org

Review URL: https://codereview.chromium.org/486713003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180654 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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