Source: Guard reference to `VideoFrame`. (#32301)

src/textures/Source.js

@@ -88,7 +88,7 @@ class Source {
 
 			target.set( data.videoWidth, data.videoHeight, 0 );
 
-		} else if ( data instanceof VideoFrame ) {
+		} else if ( ( typeof VideoFrame !== 'undefined' ) && ( data instanceof VideoFrame ) ) {
 
 			target.set( data.displayHeight, data.displayWidth, 0 );