Revert "Better vr variable handling. Refactor of #14914"

This reverts commit 67eb3c4f6bba237fe517cccf8a48af22774a708d.

src/renderers/WebGLRenderer.js

@@ -298,13 +298,7 @@ function WebGLRenderer( parameters ) {
 
 	// vr
 
-	var vr = null;
-
-	if ( typeof navigator !== 'undefined' ) {
-
-		vr = ( 'xr' in navigator ) ? new WebXRManager( _this ) : new WebVRManager( _this );
-
-	}
+	var vr = ( typeof navigator !== 'undefined' && 'xr' in navigator ) ? new WebXRManager( _this ) : new WebVRManager( _this );
 
 	this.vr = vr;