Good, Chrome: 68.0.3440.25 (Official Build) beta (64-bit) (cohort: Beta)
Bad, Chrome: 69.0.3464.0 (Official Build) dev (64-bit) (cohort: Dev)
Jaws: 2018
NVDA: 2018.2.1

Steps to repro:
# With any screen reader on, navigate to https://bugs.chromium.org/p/chromium/issues/list
# Navigate with tab, arrows
# Try to access the omnibox with ctrl+l, f6

Expected: Navigation should work

Actual: Nothing happens, after a while, you will get an option to wait for the page or exit the page. If you click exit, the tab will crash.

You are probably looking for a change made after 566621 (known good), but no later than 566622 (first known bad).
CHANGELOG URL:
The script might not always return single CL as suspect as some perf builds might get missing due to failure.
  https://chromium.googlesource.com/chromium/src/+log/7a8e4dfa00eaeb6a7e41381f29060c6c1f38ac19..6589a857b53023b5c12f85194583f13da2466264