Add WebView versions for XRSessionMode API (#10926)
Add WebView versions for XRSessionMode API (#10926)

This PR adds real values for WebView Android for the `XRSessionMode` API.  XR isn't supported in WebView altogether, so it doesn't make sense that this would be supported.
chrisdavidmills/browser-compat-data,chrisdavidmills/browser-compat-data,mdn/browser-compat-data,mdn/browser-compat-data