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Enable ChromeDriver tests on Win10 bot, as win7-rel bot is no longer
included by default in Chromium CQ.

Change-Id: Ie8d42abe069ccbcd4313d5067a2c474913c36204
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1835068Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702214}