fix(Page): fix page.goto to return Response when page pushes new state (#2468)

]Fixes #2411.

lib/FrameManager.js

@@ -774,6 +774,8 @@ class Frame {
    */
   _navigated(framePayload) {
     this._name = framePayload.name;
+    // TODO(lushnikov): remove this once requestInterception has loaderId exposed.
+    this._navigationURL = framePayload.url;
     this._url = framePayload.url;
   }
 

lib/Page.js

@@ -515,7 +515,7 @@ class Page extends EventEmitter {
     helper.removeEventListeners(eventListeners);
     if (error)
       throw error;
-    const request = requests.get(this.mainFrame().url());
+    const request = requests.get(mainFrame._navigationURL);
     return request ? request.response() : null;
 
     /**