Difficult way for close headfull chromium

When Singleton Browser Session was disabled, chromium very difficult to close.
Press to "Quit" in tray did not help. And when try to close chromium via htop in terminal, chromium closed very long time

https://user-images.githubusercontent.com/11293201/102667940-bc4f9300-419b-11eb-9428-a0ad1aa917b0.mov

The issue names no source file or test. Reproduce the slow Chromium shutdown with Singleton Browser Session disabled, compare the tray Quit action with termination from htop, and trace the browser-session shutdown path. Done means Chromium exits promptly through the reported closing methods.

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