I think this is also contributing to INSTALLER_ERROR_OTHER+110 update failures. I think we should aggressively merge the fix up through the channels if it looks safe on dev. Canary won't provide any useful data since it is never installed at system-level.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e3fe8957ee4142309e5becdd611ea46b96ed8bc8

commit e3fe8957ee4142309e5becdd611ea46b96ed8bc8
Author: grt <grt@chromium.org>
Date: Mon Nov 21 14:15:12 2016

Fix system-level detection in the mini_installer.

Check for GoogleUpdateIsMachine=1 in the environment to detect
system-level operations.

BUG= 667268 

Review-Url: https://codereview.chromium.org/2522433002
Cr-Commit-Position: refs/heads/master@{#433531}

[modify] https://crrev.com/e3fe8957ee4142309e5becdd611ea46b96ed8bc8/chrome/installer/mini_installer/configuration.cc
[modify] https://crrev.com/e3fe8957ee4142309e5becdd611ea46b96ed8bc8/chrome/installer/mini_installer/configuration.h
[modify] https://crrev.com/e3fe8957ee4142309e5becdd611ea46b96ed8bc8/chrome/installer/mini_installer/configuration_test.cc

Fix shipped to dev in 57.0.2950.4 and looks good. Requesting merge to M56.

Your change meets the bar and is auto-approved for M56 (branch: 2924)

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/f32b6800cf89f39f53b80daf857477c1fccd2449

commit f32b6800cf89f39f53b80daf857477c1fccd2449
Author: Julian Pastarmov <pastarmovj@chromium.org>
Date: Wed Dec 21 08:53:39 2016

Fix system-level detection in the mini_installer.

Check for GoogleUpdateIsMachine=1 in the environment to detect
system-level operations.

BUG= 667268 

Review-Url: https://codereview.chromium.org/2522433002
Cr-Commit-Position: refs/heads/master@{#433531}
(cherry picked from commit e3fe8957ee4142309e5becdd611ea46b96ed8bc8)

Review-Url: https://codereview.chromium.org/2595863002 .
Cr-Commit-Position: refs/branch-heads/2924@{#574}
Cr-Branched-From: 3a87aecc31cd1ffe751dd72c04e5a96a1fc8108a-refs/heads/master@{#433059}

[modify] https://crrev.com/f32b6800cf89f39f53b80daf857477c1fccd2449/chrome/installer/mini_installer/configuration.cc
[modify] https://crrev.com/f32b6800cf89f39f53b80daf857477c1fccd2449/chrome/installer/mini_installer/configuration.h
[modify] https://crrev.com/f32b6800cf89f39f53b80daf857477c1fccd2449/chrome/installer/mini_installer/configuration_test.cc