Cannot launch Chrome app once karma spec has run

[patrick99e99]

on Mac OS X 10.15 with karma-chrome-launcher 3.1.0:

1. I click Chrome on my dock, the app launches fine
2. I quit Chrome
3. I run karma
4. I click Chrome on my dock, the app does not launch
5. I quit karma
6. I click Chrome on my dock, the app launches fine.

[eppsilon]

I'm also seeing this when using 3.1.0 on macOS 10.15 (as well as 10.14). It seems like Karma is exiting without quitting Chrome.

I run Karma via ng test, and I exit Karma with CTRL-C. I wind up with lots of Chrome instances + processes piling up in Activity Monitor. I can't launch Chrome until I go through and clean them up. This started sometime in the past few months - possibly after our project moved from karma-chrome-launcher 2.2.0 to 3.1.0.