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This ensures we don't send hosts and field trials for non-MSBB users

Bug: 1146151
Change-Id: I146977f62943aaa77a0b85cd7196a13ad5ca660a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2579838Reviewed-by: Michael Crouse <mcrouse@chromium.org>
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#835259}