Chrome Version: 67.0.3396.49
OS: CrOS 10575.40.0

What steps will reproduce the problem?

(1) Put device in Dev Mode.
(2) Powerwash device. Add --rlz-ping-delay=60 to /etc/chrome_dev.conf.
(3) Go through OOBE. Login.
(4) Open chrome://net-internals
(5) Search in Omnibox
(6) Search in net-internals for "pso". Look at URL. You should see a value like: 

nonce-00035281234D7772C5D5E8A0C43D6E891F9E6B4630E4

The RLZ server requires the format to match the regexp "[A-Z0-9]+" and be exactly 50 chars long. The above string is 50 chars long but uses lowercase letters and has a dash.

The code needs to be updated such that the above would look like:

NONCE000035281234D7772C5D5E8A0C43D6E891F9E6B4630E4

So, uppercase "nonce", remove the dash, and replace it with another random A-Z0-9 value.

The code can be found at:

https://codesearch.chromium.org/chromium/src/rlz/lib/machine_id.cc?rcl=3b6c66d2e5b410ec178ea7b302501889751d4565&l=28