Simplify NodeRenderingTraversal::parentElement() a bit
Simplify NodeRenderingTraversal::parentElement() a bit

Simplify NodeRenderingTraversal::parentElement() a bit by not creating a dummy
ParentDetails object. NodeRenderingTraversal::parent() does not require passing
a ParentDetails object in parameter.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/482873002

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@180493 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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