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Moves the feature logic to a check-everything paradigm instead of doing
early returns, for the sake of easy to understand metrics.

privacy doc: http://shortn/_99lQLYJfL1

Bug: 1115259
Change-Id: I036a412104d9ccce885789637461314d50f1e967
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388270Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Brian White <bcwhite@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Commit-Queue: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#806701}