Google Chrome	72.0.3626.8 (Official Build) dev (64-bit) 
Firmware Version	Google_Eve.9584.174.0 

Steps to repro:
# Go to Login screen
# Enable ChromeVox with ctrl + alt + z
# Linear navigate with search + right arrow 
Expected: no way to get the "shelf" since it doesn't exist visually
Actual: "shelf" is highlighted and read even though it isn't there