On Posix, make all child processes quit when the browser dies, not just the renderers.

chrome/test/functional/test_clean_exit.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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 logging
 import os
 import signal
 import subprocess
 import tempfile
 import unittest
 
 import pyauto_functional
 import pyauto
 import test_utils
 
 
 class SimpleTest(pyauto.PyUITest):
 
   def ExtraChromeFlags(self):
     """Ensures Chrome is launched with custom flags.
 
     Returns:
       A list of extra flags to pass to Chrome when it is launched.
     """
     fd, self._strace_log = tempfile.mkstemp()
     os.close(fd)
-    extra_flags = ['--no-sandbox', '--renderer-clean-exit',
+    extra_flags = ['--no-sandbox', '--child-clean-exit',
                    '--renderer-cmd-prefix=/usr/bin/strace -o %s' %
                     self._strace_log]
     logging.debug('Strace file is: %s' % self._strace_log)
     return pyauto.PyUITest.ExtraChromeFlags(self) + extra_flags
 
 
   def testCleanExit(self):
     """Ensures the renderer process cleanly exits."""
     url = self.GetHttpURLForDataPath('title2.html')
     self.NavigateToURL(url)
     os.kill(self.GetBrowserInfo()['browser_pid'], signal.SIGINT)
     self.WaitUntil(lambda: self._IsFileOpen(self._strace_log))
     strace_contents = open(self._strace_log).read()
     self.assertTrue('exit_group' in strace_contents)
     os.remove(self._strace_log)
 
   def _IsFileOpen(self, filename):
     p = subprocess.Popen(['lsof', filename])
     return p.communicate()[0] == ''
 
 
 if __name__ == '__main__':
   pyauto_functional.Main()