From 407fd9636afe9bf68acdc7585abb35e613a99571 Mon Sep 17 00:00:00 2001
From: Joel Regus <joel@joelregus.com>
Date: Mon, 2 May 2016 17:31:30 -0400
Subject: [PATCH] =?UTF-8?q?Fix=20issue=20where=20observeIntersection=20was?=
 =?UTF-8?q?=20not=20returning=20the=20unlisten=20fu=E2=80=A6=20(#3060)?=
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---
 3p/integration.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/3p/integration.js b/3p/integration.js
index 4daf7c0421c5..6ddd8e821bf1 100644
--- a/3p/integration.js
+++ b/3p/integration.js
@@ -228,11 +228,12 @@ window.draw3p = function(opt_configCallback, opt_allowed3pTypes,
     // This only actually works for ads.
     const initialIntersection = window.context.initialIntersection;
     window.context.observeIntersection = cb => {
-      observeIntersection(cb);
+      const unlisten = observeIntersection(cb);
       // Call the callback with the value that was transmitted when the
       // iframe was drawn. Called in nextTick, so that callers don't
       // have to specially handle the sync case.
       nextTick(window, () => cb([initialIntersection]));
+      return unlisten;
     };
     window.context.onResizeSuccess = onResizeSuccess;
     window.context.onResizeDenied = onResizeDenied;