There seems to be some issue that causes Chrome/ChromeDriver to
unexpectedly reload during the aio e2e tests, causing flakes. It is not
clear what exactly is causing the reloading, but to the best of my
knowledge it is something inside Chrome or ChromeDriver.
Pinning Chrome to r494239 (between 62.0.3185.0 and 62.0.3186.0) fixes
the flakes.
Fixes#20159