The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/44a5f92dde8b3cb2fa8d54b02fa97d08f0ee494a

commit 44a5f92dde8b3cb2fa8d54b02fa97d08f0ee494a
Author: dspaid <dspaid@chromium.org>
Date: Mon Oct 17 23:59:36 2016

Do not watch for low disk events in guest mode.

Guest sessions do not store data on the persistent disk and therefore
should not receive notifications regarding low disk space.

BUG= 655879 
TEST=Log in to device as non-guest
Create a sufficiently large file in Downloads to trigger low disk notifications
Log out
Log in as guest user
Observe that no low disk notification is shown.

Review-Url: https://codereview.chromium.org/2420843002
Cr-Commit-Position: refs/heads/master@{#425823}

[modify] https://crrev.com/44a5f92dde8b3cb2fa8d54b02fa97d08f0ee494a/chrome/browser/chromeos/chrome_browser_main_chromeos.cc

<files-triage> Weifang, is this fixed? :)

<files-triage> fukino@ - Looks like you made a commit for this issue. Are we still seeing this?

Oops, it seems I forgot to mark this as Fixed.