Fix typo in quit_chrome.py.

chrome/test/mini_installer/quit_chrome.py

 # Copyright 2013 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.
 
 """Quits Chrome.
 
 This script sends a WM_CLOSE message to each window of Chrome and waits until
 the process terminates.
 """
 
@@ skipping 53 matching lines @@
   usage = 'usage: %prog chrome_path'
   parser = optparse.OptionParser(usage, description='Quit Chrome.')
   _, args = parser.parse_args()
   if len(args) != 1:
     parser.error('Incorrect number of arguments.')
   chrome_path = args[0]
 
   if not CloseWindows(chrome_path):
     # TODO(robertshield): Investigate why Chrome occasionally doesn't shut down.
     print 'Warning: Chrome not responding to window closure. Killing process...'
-    KillNamedProcess(chrome_path):
+    KillNamedProcess(chrome_path)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())