From d120e7e42661ace6827378c1330ca7fa59fc6246 Mon Sep 17 00:00:00 2001
From: Andrey Lushnikov <lushnikov@chromium.org>
Date: Tue, 11 Jul 2017 08:11:16 -0700
Subject: [PATCH] properly cleanup exit process listener as browser closes

---
 lib/Browser.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/lib/Browser.js b/lib/Browser.js
index 931c2bb2..0626b3d8 100644
--- a/lib/Browser.js
+++ b/lib/Browser.js
@@ -112,9 +112,11 @@ class Browser {
     let stderr = '';
     this._chromeProcess.stderr.on('data', data => stderr += data.toString('utf8'));
     // Cleanup as processes exit.
-    process.on('exit', () => this._chromeProcess.kill());
+    const onProcessExit = () => this._chromeProcess.kill();
+    process.on('exit', onProcessExit);
     this._chromeProcess.on('exit', () => {
       this._terminated = true;
+      process.removeListener('exit', onProcessExit);
       removeRecursive(this._userDataDir);
     });
     this._chromeProcess.stderr.pipe(this.stderr);