Frame::setView should not call confusingAndOftenMisusedAttached()

This caller wants Document:isActive() instead.

Review URL: https://codereview.chromium.org/53873002

git-svn-id: svn://svn.chromium.org/blink/trunk@161004 bbb929c8-8fbe-4397-9dbb-9b2b20218538