I'm assuming that it is not Google. As it appears, someone uses the name "Google". Please check your browser to see if it is actually Google.
Please attach your log files here. You should find here:
"C: \ ProgramData \ AVAST Software \ Avast \ log \ Avast Browser Cleanup.log" and
"C: \ ProgramData \ AVAST Software \ Avast \ log \ Avast Browser Cleanup-silent.log"