UserAgent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.84 Safari/537.36
Platform: 10718.71.2 (Official Build) stable-channel kevin

Steps to reproduce the problem:
1. Download TestNav app on chromebook
2. Select TN Reference from the homepage
3. Login with the below user id/pwd
   googleuser / googleuser
4. Start the test and once the test starts, hit Ctrl+Alt+Z twice. Which turns on and off the chromevox. 
5. Click userdropdown and select "Signout of testnav" option

What is the expected behavior?
chromevox should remain off on the signout screen

What went wrong?
Chromevox re-enabled on the signout screen

Did this work before? N/A 

Chrome version: 68.0.3440.87  Channel: stable
OS Version: 68.0.3440.87
Flash Version: 30.0.0.134

Additional info:

This looks like an issue with the google spokenFeedback API. We are calling two of these API's in TestNav: spokenFeedback.set, spokenFeedback.clear. Here are the steps for the issue in terms of the api calls.

We have chromevox off and then we set spokenFeedback to disabled (API).
Then we press ctrl+alt+z any number of times
Then we call spokenFeedback.clear
Chromevox is then turned on at this point, but the documentation says that the clear API will set chromevox to it's default state
Documentation: https://developer.chrome.com/apps/accessibilityFeatures#property-spokenFeedback