removed unneeded code

lib/frame-tree/content/content-frame-tree.js

@@ -104,10 +104,7 @@ this.frameTree = this.frameTree || (() => {
 	function cleanupRequest(message) {
 		const sessionId = message.sessionId;
 		const frameElements = document.querySelectorAll(FRAMES_CSS_SELECTOR);
-		if (!TOP_WINDOW) {
-			windowId = message.windowId;
-		}
-		cleanupFrames(frameElements, message.options, windowId, sessionId);
+		cleanupFrames(frameElements, message.options, message.windowId, sessionId);
 	}
 
 	function initResponse(message) {