Chrome Version: 72.0.3602.0
OS: P - Also repros on O
Device: Pixel 2 XL

What steps will reproduce the problem?
(1) Enable 3 flags:WebXR Hit Test API, WebXR Device API, WebXR Gamepad.
(2) Go to https://immersive-web.github.io/webxr-samples/positional-audio.html

What is the expected result? Page should load, Chrome shouldn't crash.

What happens instead? Chrome crashes. Every time.

Crash ID's:
247d417c3f4a34cb 
73c185f25d5ae35c