Fix checked mode on browser.

utils/compiler/buildbot.py

 #!/usr/bin/python
 
 # Copyright (c) 2011 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.
 
 """Dart2js buildbot steps
 
 Runs tests for the  dart2js compiler.
 """
@@ skipping 322 matching lines @@
 
   test_flags = []
   if shard_index:
     test_flags = ['--shards=%s' % total_shards, '--shard=%s' % shard_index]
 
   # First we run all the regular tests.
   status = TestCompiler(runtime, mode, system, option, test_flags,
                         is_buildbot)
 
   if (status == 0
-      and runtime != 'chrome'
+      and (system == 'linux' or runtime != 'chrome')
       and runtime != 'opera'
       and runtime != 'ff'
       and runtime != 'ie'
       and runtime != 'safari'):
     status = TestCompiler(runtime, mode, system, option,
                           test_flags + ['--checked'], is_buildbot)
 
   if runtime != 'd8': CleanUpTemporaryFiles(system, runtime)
   if status != 0: print '@@@STEP_FAILURE@@@'
   return status
 
 if __name__ == '__main__':
   sys.exit(main())