Mark two tests as needing Mac rebaselines after r168130.

At the time that landed, these were already marked as needing rebaselines for a
different bug, and the rebaselining for that bug crossed in-flight, leaving
these with incorrect baselines.

BUG=345609
TEST=none
TBR=tkent

Review URL: https://codereview.chromium.org/184043012

git-svn-id: svn://svn.chromium.org/blink/trunk@168168 bbb929c8-8fbe-4397-9dbb-9b2b20218538