The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/7226ec25f1535e89e83bba9c2d6e63a7b4dfbce7

commit 7226ec25f1535e89e83bba9c2d6e63a7b4dfbce7
Author: Hector Carmona <hcarmona@chromium.org>
Date: Tue Jan 22 23:11:52 2019

Navi: Enable new onboarding workflow by default on Mac OS.

Bug: 924274
Change-Id: I782ef19e63fb7f42ce909f874e9932d8d7f3cbd6
Reviewed-on: https://chromium-review.googlesource.com/c/1420017
Reviewed-by: Dan Beam <dbeam@chromium.org>
Commit-Queue: Hector Carmona <hcarmona@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624980}
[modify] https://crrev.com/7226ec25f1535e89e83bba9c2d6e63a7b4dfbce7/chrome/browser/ui/webui/welcome/nux_helper.cc