Chrome Version:
65.0.3325.9 Official Build dev 32-bit

What steps will reproduce the problem?
(1) Open the WiFi connection dialog, attempt to join a WiFi network with PSK security
(2) Type the password in
(3) Notice that the 'Connect' button is still greyed out
(4) Tap on the background of the dialog
(5) The Connect button now enables

What is the expected result?

Connect button enables by itself