Clean up temporary directories in buildbot script.

tools/testing/run_selenium.py

 #!/usr/bin/python
 
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 #
 
 """Script to actually open a browser and perform the test, and reports back with
 the result. It uses Selenium WebDriver when possible for running the tests. It
 uses Selenium RC for Safari.
@@ skipping 125 matching lines @@
     backup_safari_prefs = os.path.dirname(__file__) + '/com.apple.Safari.plist'
     if os.path.exists(backup_safari_prefs):
       shutil.copy(backup_safari_prefs,
            '/Library/Preferences/com.apple.Safari.plist')
     sel = selenium.selenium('localhost', 4444, "*safari", 'file://' + html_out)
     try:
       sel.start()
       return sel
     except socket.error:
       print 'ERROR: Could not connect to Selenium RC server. Are you running' +\
-          ' java -jar selenium-server-standalone-2.15.0.jar? If not, start ' + \
+          ' java -jar selenium-server-standalone-*.jar? If not, start ' + \
           'it before running this test.'
       sys.exit(1)
   else:
     raise Exception('Incompatible browser and platform combination.')
 
 def close_browser(browser):
   if browser is None:
     return
   if isinstance(browser, selenium.selenium):
     browser.stop()
@@ skipping 114 matching lines @@
   browser = start_browser(browser_name, html_out)
 
   try:
     output = run_test_in_browser(browser, html_out, timeout, is_perf)
     return report_results(is_perf, output)
   finally:
     close_browser(browser)
 
 if __name__ == "__main__":
   sys.exit(main(sys.argv))