Safely check for XRWebGLBinding (#30319)

Author: zonkypop

src/renderers/webxr/WebXRManager.js

@@ -277,7 +277,7 @@ class WebXRManager extends EventDispatcher {
 
 				// Check that the browser implements the necessary APIs to use an
 				// XRProjectionLayer rather than an XRWebGLLayer
-				const useLayers = XRWebGLBinding !== undefined && 'createProjectionLayer' in XRWebGLBinding.prototype;
+				const useLayers = typeof XRWebGLBinding !== 'undefined' && 'createProjectionLayer' in XRWebGLBinding.prototype;
 
 				if ( ! useLayers ) {