From 7136b3aaffedf1707adf38550c907daa7e7a2e23 Mon Sep 17 00:00:00 2001
From: Andrey Lushnikov <lushnikov@chromium.org>
Date: Tue, 13 Jun 2017 15:00:55 -0700
Subject: [PATCH] Improve inPageCallback handling

This patch improves inPageCallback handling so that it doesn't
retain any variables.
---
 lib/Page.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/lib/Page.js b/lib/Page.js
index 2f8c9b3a8e4..d93030b8a60 100644
--- a/lib/Page.js
+++ b/lib/Page.js
@@ -128,9 +128,11 @@ class Page extends EventEmitter {
         function inPageCallback(callbackName) {
             window[callbackName] = (...args) => {
                 window[callbackName].__args = args;
-                window[callbackName].__result = undefined;
                 debugger;
-                return window[callbackName].__result;
+                var result = window[callbackName].__result;
+                delete window[callbackName].__result;
+                delete window[callbackName].__args;
+                return result;
             };
         }
     }