Node::setNeedsStyleRecalc() should not call confusingAndOftenMisusedAttached()

This caller wants inActiveDocument(). There's no reason to bail out of
setting needsStyleRecalc before going through lazyAttach as long as
we're in an active document.

Review URL: https://codereview.chromium.org/53573003

git-svn-id: svn://svn.chromium.org/blink/trunk@161103 bbb929c8-8fbe-4397-9dbb-9b2b20218538