ChromeOS version: 63.0.3239.140 
ChromeOS device model: Acer Chromebook 11 (C740)  
Case#: 14821147

Description: Select-to-speak is enabled by itself while students are using their Chromebooks. 


Steps to reproduce: 
There are no steps that would trigger the issue at 100% of the time, but most of cases it happens when user access to Drive app. 
video of the issue: https://drive.google.com/open?id=15tcLtZwkj1p5Pj8ZZ4zzw46EQowl4jRD

Current Behavior / Reproduction: 
select-to-speak doesn't stop when disabled
Expected Behavior: 
select-to-speak stop when disabled
Drive link to logs: https://drive.google.com/open?id=1WNzGlA29FSbjpJ6xNb7ZV46KvWxtptxP
policy: https://drive.google.com/open?id=1qc5soxFpMxPbVuLfj1D5061tDAxzgETK


customer info: https://drive.google.com/open?id=1UaTP2muLh1ctK4RTKQUhgfBCTkBWeQa22s0Z73fMI4A

it could be linked to  crbug.com/778427