GitLab

This CL removes two redundant PostTask usages from SandboxedUnpacker. In both
the cases, we are already on the correct sequence, hence we can call the
function synchronously.

BUG=None

Change-Id: I42deaad16bce1db2e2e1905aa13253251791c8b6
Reviewed-on: https://chromium-review.googlesource.com/1110839Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569784}