Import Cronet version 114.0.5709.3

Project import generated by Copybara.

FolderOrigin-RevId: /tmp/copybara-origin/src
Test: none
Change-Id: I263aa6b692a17ac2471b98b6e662b26dd1327c9c
diff --git a/build/dir_exists.py b/build/dir_exists.py
index f95a52d..da9813f 100755
--- a/build/dir_exists.py
+++ b/build/dir_exists.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # Copyright 2011 The Chromium Authors
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.