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We added a sampling scheme when ukm was introduced
back in the day to control the amount of data we
report to the server.
Now that there is a general mechanism for controling
the data we can remove our own version of resampling
and rely only on the dashboard team to take care of
that.

Bug: 895463
Change-Id: If23332437205aa027b77a1140f28b9492692791a
Reviewed-on: https://chromium-review.googlesource.com/c/1283941Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Reviewed-by: Bryan McQuade <bmcquade@chromium.org>
Commit-Queue: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601247}