Tweak heuristic to hide fixed-size parent <div>s for one more case.
Tweak heuristic to hide fixed-size parent <div>s for one more case.

BUG=http://code.google.com/p/chromium/issues/detail?id=63695
TEST=http://www.zontera.com/banners/clients_work/floating_flash/centered/dove/

Review URL: http://codereview.chromium.org/6266009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@71761 0039d316-1c4b-4281-b951-d872f2087c98

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