headless: Don't run tests during the build

headless/lib/browser/client_api_generator_unittest.py

Index: headless/lib/browser/client_api_generator_unittest.py
diff --git a/headless/lib/browser/client_api_generator_unittest.py b/headless/lib/browser/client_api_generator_unittest.py
old mode 100644
new mode 100755
index d9d3f81dea79e90435920ddd0aa04af68bbb46b4..6b76cfe910d420fc73b5bb4cea301407e17e1c92
--- a/headless/lib/browser/client_api_generator_unittest.py
+++ b/headless/lib/browser/client_api_generator_unittest.py
@@ -1,8 +1,9 @@
+#!/usr/bin/env python
+
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import argparse
 import client_api_generator
 import shutil
 import sys
@@ -497,10 +498,4 @@ class ClientApiGeneratorTest(unittest.TestCase):
 
 
 if __name__ == '__main__':
-  cmdline_parser = argparse.ArgumentParser()
-  cmdline_parser.add_argument('--stamp')
-  args = cmdline_parser.parse_args()
   unittest.main(verbosity=2, exit=False, argv=sys.argv[:1])
-  if args.stamp:
-    with open(args.stamp, 'a') as f:
-      pass