Add mac_gpu to the default set of try servers for Blink CLs.

This configuration is successfully handling the experimental load from
the Chromium and Blink commit queues, and its hardware has just been
fully built out. Expand its testing.

BUG=353864

Review URL: https://codereview.chromium.org/275433009

git-svn-id: svn://svn.chromium.org/blink/trunk@173796 bbb929c8-8fbe-4397-9dbb-9b2b20218538
CORS-enabled font fetching fallback for redirection

We should try CORS-disabled font fetching when CORS-enabled
fetching failed due to redirection.

BUG=371739

Review URL: https://codereview.chromium.org/273053002

git-svn-id: svn://svn.chromium.org/blink/trunk@173797 bbb929c8-8fbe-4397-9dbb-9b2b20218538