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In order to check if an experiment is enabled from //chromeos, this CL
also moves the feature flag from //chrome/common/chrome_features to
//chromeos/chromeos_features.

Bug: 888392
Change-Id: I05c6f7f096c8f1ed98e867ac147da3607c043776
Reviewed-on: https://chromium-review.googlesource.com/1242253Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Commit-Queue: Jia Meng <jiameng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594157}