[7.8] update chromedriver to 84 (#72228)#72376

Merged

dmlemeshko merged 1 commit intoelastic:7.8from dmlemeshko:backport/7.8/pr-72228

Jul 19, 2020

+26-10

Commits on Jul 18, 2020

update chromedriver to 84 (elastic#72228 )

dmlemeshko
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elasticmachine
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