Google Chrome	70.0.3532.8 (Official Build) dev (64-bit)
Firmware Version Google_Caroline.7820.384.0

Steps to reproduce:

# Start ChromeVox with ctrl + alt + z
# Go to Launcher > open Text app
# Type anything on multiple lines
# Use linear navigation to navigate back and forth through the lines 
# Press the arrows keys on their own to go up, down, left, or right
Expected: caret moves, able to edit
Actual: nothing happens