Magnetometer: entire API is behind a flag in Chromium

[ddbeck]

via @foolip in web-platform-dx/web-features#2631

In Chromium the features is controlled by a flag which is off by default: https://source.chromium.org/chromium/chromium/src/+/main:third_party/blink/renderer/platform/runtime_enabled_features.json5;l=3940-3943;drc=bdbfc851687b28b24b80bccbc4c027bfe05a701b

[Fyrd]

Thanks! Looks like this was the result of the initial addition of the Magnetometer feature, seems I noticed that it needed to be fixed but failed to actually do so. 😬