GitLab

It appears that this flag has lost its meaning. Removing
it.

Also unsubscribing from further PDM changes once the callback
is called.

Bug: b/168445878
Change-Id: I0222043e53070fde7a36ba507d6ed95b4d082d3e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414395
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808829}