This update for chromium fixes the following issues:

Chromium 91.0.4472.164 (boo#1188373)

* CVE-2021-30559: Out of bounds write in ANGLE
* CVE-2021-30541: Use after free in V8
* CVE-2021-30560: Use after free in Blink XSLT
* CVE-2021-30561: Type Confusion in V8
* CVE-2021-30562: Use after free in WebSerial
* CVE-2021-30563: Type Confusion in V8
* CVE-2021-30564: Heap buffer overflow in WebXR
* Various fixes from internal audits, fuzzing and other initiatives