/etc/signon-ui/webkit-options.d/accounts.google.com.conf is in account-plugin-google 0.12+16.04.20160126-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | ViewportWidth = 480
ViewportHeight = 420
UsernameField = input[name="Email"]
PasswordField = input[name="Passwd"]
# Accept all https URLs, and add as exceptions those http only
# URLs which are used in some countries.
# See https://bugs.launchpad.net/bugs/1074733
AllowedUrls = (https://.*|http://[^/]*google\\.[^.]+/accounts/.*)
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