Chrome: 71.0.3354.0 DEV

Steps to repro:
# Enable chromevox with ctrl+alt+z
# Open file manager and tab to the tree
# Use arrow keys to navigate the tree
# Notice that for each item, Chromevox says 'not selected level 1'
# Expand 'my files'
# Navigate down to downloads, and back up to 'my files'
# Notice that Chromevox says 'collapsed' though it is expanded
# Navigate to a file several folders deep
# Notice chromevox still says 'level 1'
# Notice that only 'Google Drive' speaks 'collapsed' or 'expanded', but none of it's sub folders

Expected: Chromevox should speak the correct state: expanded or collapsed.
Chromevox should speak the correct level.
Chromevox should only speak 'selected' or 'not selected' only if it is possible to select more than one item at a time.
Otherwise, Chromevox should only speak tree item name, index of item in tree, and the state.

Actual: State is not always correctly spoken, all tree items are 'not selected' and each item is at 'level 1'