removed obsolete code

lib/single-file/frame-tree.js

@@ -48,7 +48,6 @@ this.frameTree = this.frameTree || (() => {
 		get: async options => {
 			const sessionId = options.sessionId;
 			options = JSON.parse(JSON.stringify(options));
-			options.win = null;
 			return new Promise(resolve => {
 				sessions.set(sessionId, { frames: [], resolve });
 				initRequest({ windowId: "0", sessionId, options });