Remove display:compact as per https://groups.google.com/a/chromium.org/d/topic/blink-dev/j6QErzkX4RE/discussion.

display: compact does the same thing as display: block and is only in
WebKit/Blink browsers. It's used on 0.02% of pageviews, but for many of
those uses it's likely used on a block anyways, so the likelihood
of removing this breaking content is quite low.

Review URL: https://codereview.chromium.org/52713012

git-svn-id: svn://svn.chromium.org/blink/trunk@161092 bbb929c8-8fbe-4397-9dbb-9b2b20218538