www/chromium: update to 54.0.2840.100
Submitted by: clutton <clutton@zoho.com>
Reviewed by: cpm, rene
Obtained from: https://github.com/paranormal/
MFH: 2016Q4
Security: https://vuxml.freebsd.org/freebsd/769ba449-79e1-11e6-bf75-3065ec8fd3ec.html
Security: https://vuxml.freebsd.org/freebsd/653a8059-7c49-11e6-9242-3065ec8fd3ec.html
Security: https://vuxml.freebsd.org/freebsd/9c135c7e-9fa4-11e6-a265-3065ec8fd3ec.html
Security: https://vuxml.freebsd.org/freebsd/9118961b-9fa5-11e6-a265-3065ec8fd3ec.html
Security: https://vuxml.freebsd.org/freebsd/ae9cb9b8-a203-11e6-a265-3065ec8fd3ec.html
Security: https://vuxml.freebsd.org/freebsd/a3473f5a-a739-11e6-afaa-e8e0b747a45a.html
Differential Revision: https://reviews.freebsd.org/D8517