Remove prefixes in imported shape-outside tests

Now that the shape properties are unprefixed, import the tests without
the prefixes.

R=esprehn@chromium.org

Review URL: https://codereview.chromium.org/40813004

git-svn-id: svn://svn.chromium.org/blink/trunk@160502 bbb929c8-8fbe-4397-9dbb-9b2b20218538