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Currently if there is no whitelist, we record everything. We shouldn't do this since if a user has no field trial params (first run, etc.), they will record everything, avoiding the whitelist.

Also changed a bitwise and to && while I was making a change. No-op but seems bad style (and apparently can be different as & doesn't shortcut).

Bug: 820632
Change-Id: I3fd3b1ca6669294e61467bb0f4d0ad87fb2ff576
Reviewed-on: https://chromium-review.googlesource.com/957384
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#544034}