OK, I haven't had this (as far as I'm aware), but I have the update toaster set to 2 seconds, so it is possible it slipped under the radar.
A couple of points though, I definitely don't have Chrome installed and I have this option disabled even though it shouldn't be required if I don't have chrome. From the avastUI, Settings, Troubleshooting, check the 'Do not use Chrome as avast! default browser' option.
I don't know if this will make a difference, but for me it clarifies I want nothing to do with chrome. Possibly having this active (unchecked) may possibly give the impression you have Chrome.
With this option checked my avast5.ini settings are:
[Onlines]
toaster-virus-update_70_ise-toaster=3
/fa/en-gb/toaster-virus-update_t9_70_com-upgrade-is=3
/fa/en-gb/toaster-virus-update_t10_70_soft-trial=1
Bear in mind I'm also running the beta build 7.0.1068, so one or more of those may be different as a result of using the beta.