Chrome: 71.0.3354.0 DEV

Steps to repro:
# Enable chromevox with ctrl+alt+z
# Open Chrome Remote Desktop -  
# Use search+right arrow to navigate
# Notice that actionable buttons like 'options' and 'minimize' are not announced as buttons

Expected: Chromevox would call these buttons and they would not have the word icon

Actual: They are only announced as icons