Rebaseline svg/as-image/animated tests for Mac 10.7

These tests were historically flaky, but mostly look now like they simply
need rebaselines for Lion. This rebaseline will be useful in assessing
future flakiness for these tests.

R=pdr@chromium.org
BUG=262332

Review URL: https://codereview.chromium.org/20211002

git-svn-id: svn://svn.chromium.org/blink/trunk@154876 bbb929c8-8fbe-4397-9dbb-9b2b20218538