Google Chrome	71.0.3554.0 (Official Build) dev (64-bit)
Firmware Version	Google_Caroline.7820.384.0

Steps to repro:
# Open the Menu
# Navigate to Keyboard shortcuts
# Press the up arrow or down arrow
Expected: keyboard focus remains in the keyboard shortcuts dialog, scrolls up and down
Actual: keyboard focus remains behind the dialog, unable to scroll up and down, can't get to shortcuts below what's shown