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This exposed a bug in the existing implementation (see test failures in patchset 1) since the UKM enabled state was being set based on the last profile's state instead of all profiles.

Bug: 1107439, 1088488
Change-Id: I8191e69f4abfa7a7a0e0fab7093378372b00310a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2308938
Commit-Queue: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#790896}