GitLab

This CL is mostly a revert of
https://chromium-review.googlesource.com/c/chromium/src/+/1195682/, and
also adds a DCHECK that ensures that we don't enable third-party
blocking if the QuarantineFile() functions doesn't run out-of-process.

Bug: 870998
Change-Id: I7ff74b1595aa889c12564847d7735825b33f7ae7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1899752Reviewed-by: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Asanka Herath <asanka@chromium.org>
Commit-Queue: Patrick Monette <pmonette@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713538}