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Messed up the bug number, but:

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/2340c50f02068d3a5b7c5507809d788491af554c

commit 2340c50f02068d3a5b7c5507809d788491af554c
Author: Michael Giuffrida <michaelpg@chromium.org>
Date: Fri Sep 14 01:12:07 2018

Enable demo mode by default and remove flag

Remove --enable-demo-mode flag and always enable Demo Mode when ARC++
is supported.

The --enable-offline-demo-mode flag will be removed separately for ease
of reverting in case that feature ends up being delayed.

Bug: 812037
Change-Id: Ie3ac7a98af21d3fab3e3c7f2aaff0c71a2bcaf08
Reviewed-on: https://chromium-review.googlesource.com/1195116
Commit-Queue: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Alexander Alekseev <alemate@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587941}(cherry picked from commit edaa5e8c0a20af0e78184d1d85b08268becd94c4)

TBR=michaelpg@chromium.org

Change-Id: Ie3ac7a98af21d3fab3e3c7f2aaff0c71a2bcaf08
Reviewed-on: https://chromium-review.googlesource.com/1226170
Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Cr-Commit-Position: refs/branch-heads/3538@{#396}
Cr-Branched-From: 79f7c91a2b2a2932cd447fa6f865cb6662fa8fa6-refs/heads/master@{#587811}
[modify] https://crrev.com/2340c50f02068d3a5b7c5507809d788491af554c/chrome/browser/chromeos/login/demo_mode/demo_setup_controller.cc
[modify] https://crrev.com/2340c50f02068d3a5b7c5507809d788491af554c/chrome/browser/chromeos/login/demo_setup_browsertest.cc
[modify] https://crrev.com/2340c50f02068d3a5b7c5507809d788491af554c/chrome/browser/chromeos/login/wizard_controller_browsertest.cc
[modify] https://crrev.com/2340c50f02068d3a5b7c5507809d788491af554c/chromeos/chromeos_switches.cc
[modify] https://crrev.com/2340c50f02068d3a5b7c5507809d788491af554c/chromeos/chromeos_switches.h