Fix typo.

tools/bots/compiler.py

 #!/usr/bin/python
 
 # Copyright (c) 2012, 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.
 
 """
 Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
@@ skipping 207 matching lines @@
     TestStep("dart2js", mode, system, 'dart2js', runtime, ['html'], flags)
   else:
     # Run the default set of test suites.
     TestStep("dart2js", mode, system, 'dart2js', runtime, [], flags)
 
     # TODO(kasperl): Consider running peg and css tests too.
     extras = ['dart2js_extra', 'dart2js_native', 'dart2js_foreign']
     extras_flags = flags
     if (system == 'linux'
         and runtime == 'd8'
-        and not '--host-checked' in extra_flags):
+        and not '--host-checked' in extras_flags):
       # Run the extra tests in checked mode, but only on linux/d8.
       # Other systems have less resources and tend to time out.
       extras_flags = extras_flags + ['--host-checked']
     TestStep("dart2js_extra", mode, system, 'dart2js', runtime, extras,
              extras_flags)
 
 
 def _DeleteTempWebdriverProfiles(directory):
   """Find all the firefox profiles in a particular directory and delete them."""
   for f in os.listdir(directory):
@@ skipping 82 matching lines @@
   """
   with bot.BuildStep('Build SDK and d8'):
     args = [sys.executable, './tools/build.py', '--mode=' + build_info.mode,
             'dart2js_bot']
     print 'Build SDK and d8: %s' % (' '.join(args))
     bot.RunProcess(args)
 
 
 if __name__ == '__main__':
   bot.RunBot(GetBuildInfo, RunCompilerTests, build_step=BuildCompiler)