Chrome Version       : 65.0.3316.0
OS Version: 10293.0.0

What steps will reproduce the problem?
1. Open files app, navigate around
2. Press Back key or button in system tray (touch-view) mode

What is the expected result?

Files.app should navigate to its previous location. 

What happens instead of that?

Files.app does nothing.


Please provide any additional information below. Attach a screenshot if
possible.

UserAgentString: Mozilla/5.0 (X11; CrOS x86_64 10293.0.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3316.0 Safari/537.36