Fix Capybara Readtimeout error on Travis
Fix Capybara Readtimeout error on Travis

Starting with chromedriver 80 switching between frames can cause
`Timed out receiving message from renderer` errors. [1]

Downgrade to 79 as a workaround.

[1] https://bugs.chromium.org/p/chromedriver/issues/detail?id=3335&q=Timed%20out%20receiving%20message%20from%20renderer%3A&can=2

REDMINE-17430

codevise/pageflow,tf/pageflow,tf/pageflow,codevise/pageflow,codevise/pageflow,codevise/pageflow,tf/pageflow,tf/pageflow