www/chromium: Update to 83.0.4103.106 and fix synchronization

PR: 244185, 246387
Reported by: bourne.identity@hotmail.com
Approved by: chromium@ (rene), cem
Obtained from: Robert Nagy via OpenBSD port
MFH: 2020Q2
Security: https://www.vuxml.org/freebsd/6a5d15b6-b661-11ea-8015-e09467587c17.html
Differential Revision: https://reviews.freebsd.org/D25449