[scheduling] Use ScopedTaskEnvironment instead of MessageLoop in ssl_errors

MessageLoop will go away, eventually.

BUG=891670

Change-Id: I297de47c1dd4d2a58276c136d8b48216ed4fd769
Reviewed-on: https://chromium-review.googlesource.com/c/1353889
Reviewed-by: Carlos IL <carlosil@chromium.org>
Commit-Queue: Carlos Caballero <carlscab@google.com>
Cr-Commit-Position: refs/heads/master@{#614388}
1 file changed