Remove usage of prefs::kDataSaverEnabled in DataUseMeasurementBT

One of several CLs to clean up usage of this pref.

Bug: 934399
Change-Id: I9dc51cfa66a88c4ab917e2ae8f03ffdcdb4455bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1529794
Reviewed-by: rajendrant <rajendrant@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641983}
1 file changed