Security update for Chromium (important)

This update for Chromium to version 66.0.3359.170 fixes the following issues: Security issues fixed boo1092923: - CVE-2018-6121: Privilege Escalation in extensions - CVE-2018-6122: Type confusion in V8 - CVE-2018-6120: Heap buffer overflow in PDFium - Various fixes from internal audits, fuzzing a...