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This flag will control whether or not the new custom tab bar UI is used.

Bug: 853593
Change-Id: Ie8ab91d10fc6543ab560a50795dd5e26b8e31146
Reviewed-on: https://chromium-review.googlesource.com/c/1312135
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604787}