GitLab

When the server sends down a pushed stream and later on cancels it,
there's currently a race condition. If the pushed stream was not
adopted a request is sent for it, but if it was, it currently fails
in a user-visible way.
This CL fixes that by retrying the request if a pushed stream was
adopted and later cancelled.

Bug: 798508
Change-Id: Ia580cd4bad355cf4c5738e03db8dbfcf80716ae9
Reviewed-on: https://chromium-review.googlesource.com/848776Reviewed-by: Bence Béky <bnc@chromium.org>
Commit-Queue: Yoav Weiss <yoav@yoav.ws>
Cr-Commit-Position: refs/heads/master@{#527000}