buildbot web-chrome-linux does not have selenium installed

[DartBot]

This issue was originally filed by ngeoffray@google.com

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We're using 'drt' instead. Should we use selenium or was the intent to be have faster turnaround with drt?

[efortuna]

The intent was to have faster turnaround with drt for that bot, as well as that's the only bot running drt (the others use actual chrome). We wanted to have some test coverage using DRT (in fact the Mac-chrome bot is also supposed to be running DRT, but got switched over to Chrome proper due to some tip-of-tree Chrome bugs and never got switched back)

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Added AsDesigned label.