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The version needs to be passed around, and for a single floc
computation cycle, the blocklist service is supposed validate the
version from sorting-lsh output to make sure they are in sync. This is
to address race conditions when a new component comes between the 2
file reads.

Bug: 1062736
Change-Id: I597565902fb8e893c7481cee496411880c6839b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2443495
Commit-Queue: Yao Xiao <yaoxia@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Reviewed-by: Josh Karlin <jkarlin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813010}