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Since r708618 we are using the initiator origin (rather than process
lock fallback) for calculating request_initiator_site_lock.  Because
of this, it should be fine to enable BackToAboutBlank test even if
we don't have a guarantee that all processes are locked.

Bug: 888079
Change-Id: Ied1feaaff41dbc693416c9072f2f3d0849c7aabc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2031930Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Łukasz Anforowicz <lukasza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#737131}