refactor: rename XR to XRSystem

chore: fix formatting
refactor: change filename and ref to xrsystem
refactor: change filename XRSystem.webidl
refactor: update crate in navigator
refactor: use XRSystem instead of XR in navigator
refactor: update Bindings.conf
refactor: use XRSystemMethods

fix: update assertions for XRSystem

fix: update manifest json

components/script/dom/webidls/XRSystem.webidl

@@ -0,0 +1,35 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+// https://immersive-web.github.io/webxr/#xrsystem-interface
+[SecureContext, Exposed=Window, Pref="dom.webxr.enabled"]
+interface XRSystem: EventTarget {
+  // Methods
+  Promise<boolean> isSessionSupported(XRSessionMode mode);
+  Promise<XRSession> requestSession(XRSessionMode mode, optional  XRSessionInit parameters = {});
+
+  // Events
+  // attribute EventHandler ondevicechange;
+};
+
+[SecureContext]
+partial interface Navigator {
+  [SameObject, Pref="dom.webxr.enabled"] readonly attribute XRSystem xr;
+};
+
+enum XRSessionMode {
+  "inline",
+  "immersive-vr",
+  "immersive-ar"
+};
+
+dictionary XRSessionInit {
+  sequence<any> requiredFeatures;
+  sequence<any> optionalFeatures;
+};
+
+partial interface XRSystem {
+  // https://github.com/immersive-web/webxr-test-api/
+  [SameObject, Pref="dom.webxr.test"] readonly attribute XRTest test;
+};