Remove isActiveInsertionPoint check from recalcStyle
Remove isActiveInsertionPoint check from recalcStyle

NodeRenderingTraversal::parent returns null for active insertion points
after r161137 which means parentRenderStyle() would be null too so
there's no reason to have this check.

Review URL: https://codereview.chromium.org/59143003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@161330 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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