This is pretty bad, we should get this in to 56.

dpapad@ - Can you take a look at this one? I don't see any reason to suspect that this is cros specific. The relationship between settings-about-page and settings-detailed-build-info is a little involved. It is not clear to me how the channel info in settings-detailed-build-info is intended to be updated.

@stevenjb: This is CrOS specific because the channel switcher dialog only exists on ChromeOS. The channel is populated with a simple call to the about page's C++ handler, see [1] and [2]

[1] https://cs.chromium.org/chromium/src/chrome/browser/resources/settings/about_page/channel_switcher_dialog.js?q=channel_switcher_dialog.js&sq=package:chromium&dr&l=49,52
[2] https://cs.chromium.org/chromium/src/chrome/browser/ui/webui/settings/about_handler.cc?l=350

I am not able to repro locally (but I am also not using a real ChromeOS device on beta, just faking the data that is coming from C++, and using CrOS build for Linux)

Should be fairly simple to debug if you have a CrOS device on beta. Re-assigning back, and feel free to ping me for help.

OK, my plate is lightening, I will look into this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd

commit 9d01f7a426ca85db9b12a4db69f9bd63efb89dcd
Author: stevenjb <stevenjb@chromium.org>
Date: Thu Dec 08 01:46:40 2016

Settings: About: Fix cros channel info.

BUG= 665705 
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:closure_compilation

Review-Url: https://codereview.chromium.org/2538043006
Cr-Commit-Position: refs/heads/master@{#437125}

[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/about_page.js
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/about_page_browser_proxy.js
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/channel_switcher_dialog.js
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/compiled_resources2.gyp
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/detailed_build_info.html
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/resources/settings/about_page/detailed_build_info.js
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/ui/webui/settings/about_handler.cc
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/browser/ui/webui/settings/about_handler.h
[modify] https://crrev.com/9d01f7a426ca85db9b12a4db69f9bd63efb89dcd/chrome/test/data/webui/settings/about_page_tests.js

Thanks!