Filed by sheriff-o-matic@appspot.gserviceaccount.com on behalf of engedy@chromium.org

In a flaky manner, often there are test runs with *all* extensions_browsertests timing out chromium.win/Win10 Tests x64 (dbg). This has started a while ago, presently unclear when exactly.

See:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Tests%20x64%20%28dbg%29?limit=200
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8940063868445216256/+/steps/extensions_browsertests_on_Windows-10-15063/0/stdout