If WebXR were enabled by default without taking any action, the web_conformance tests would fail because the setCompatibleXRDevice on the WebGLContext would be unexpected. Tests need to be updated to prevent this. 

Test to be updated: https://github.com/KhronosGroup/WebGL/blob/master/sdk/tests/conformance/context/methods.html
 

When the WebXR Device API is enabled, the webgl_conformance_tests fail because the setCompatibleXRDevice on the WebGLContext is be unexpected. The WebGL conformance tests need to be updated to allow setCompatibleXRDevice.

Test to be updated: https://github.com/KhronosGroup/WebGL/blob/master/sdk/tests/conformance/context/methods.html