The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/194dc32cac75a954d252d0a1b8ea4aa81eccd8ec

commit 194dc32cac75a954d252d0a1b8ea4aa81eccd8ec
Author: xdai <xdai@chromium.org>
Date: Wed Nov 30 18:24:03 2016

[CUPS] Fix the browser crash in CUPS settings UI in guest mode.

The reason for the crash is that there is no PrinterPrefManager
keyed service for the guest profile or incognito profile. In order
to fix this, we only allow a regular profile to access the CUPS
printers settings UI.

BUG= 667395 

Review-Url: https://codereview.chromium.org/2535303003
Cr-Commit-Position: refs/heads/master@{#435342}

[modify] https://crrev.com/194dc32cac75a954d252d0a1b8ea4aa81eccd8ec/chrome/browser/chromeos/printing/printer_pref_manager_factory.cc
[modify] https://crrev.com/194dc32cac75a954d252d0a1b8ea4aa81eccd8ec/chrome/browser/ui/webui/options/browser_options_handler.cc
[modify] https://crrev.com/194dc32cac75a954d252d0a1b8ea4aa81eccd8ec/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc

Thanks for the fix.  I'll need to make sure that PrintPreview doesn't crash as well.

I think we'll want zeroconf printing in guest mode eventually.  I've filed crbug.com/669998 so we don't lose it.

Thanks. I'll close this issue then.

Issue 662184 has been merged into this issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/20377bfe446fac2c6e8e6db8ff753b7995bf932b

commit 20377bfe446fac2c6e8e6db8ff753b7995bf932b
Author: skau <skau@chromium.org>
Date: Fri Jan 06 17:52:29 2017

Revert "[CUPS] Fix the browser crash in CUPS settings UI in guest mode."

This reverts commit 194dc32cac75a954d252d0a1b8ea4aa81eccd8ec.

With https://codereview.chromium.org/2610373003/ enabling printing in
incognito, we can reenable printer setup in Guest Mode.

BUG= 667395 

Review-Url: https://codereview.chromium.org/2616003002
Cr-Commit-Position: refs/heads/master@{#441972}

[modify] https://crrev.com/20377bfe446fac2c6e8e6db8ff753b7995bf932b/chrome/browser/chromeos/printing/printer_pref_manager_factory.cc
[modify] https://crrev.com/20377bfe446fac2c6e8e6db8ff753b7995bf932b/chrome/browser/ui/webui/options/browser_options_handler.cc
[modify] https://crrev.com/20377bfe446fac2c6e8e6db8ff753b7995bf932b/chrome/browser/ui/webui/settings/md_settings_localized_strings_provider.cc