Presubmit should now interpret "Closed" (upper case C) as meaning the tree is...

PRESUBMIT.py

 # Copyright (c) 2010 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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into gcl.
 """
 
@@ skipping 70 matching lines @@
         '  Thanks for your patience.'))
   results.extend(_CommonChecks(input_api, output_api))
   # TODO(thestig) temporarily disabled, doesn't work in third_party/
   #results.extend(input_api.canned_checks.CheckSvnModifiedDirectories(
   #    input_api, output_api, sources))
   # Make sure the tree is 'open'.
   results.extend(input_api.canned_checks.CheckTreeIsOpen(
       input_api,
       output_api,
       'http://chromium-status.appspot.com/current?format=raw',
-      '.*closed.*'))
+      '(?i).*closed.*'))
   results.extend(input_api.canned_checks.CheckRietveldTryJobExecution(input_api,
       output_api, 'http://codereview.chromium.org', ('win', 'linux', 'mac'),
       'tryserver@chromium.org'))
 
   # These builders are just too slow.
   IGNORED_BUILDERS = [
     'Chromium XP',
     'Chromium Mac',
     'Chromium Arm (dbg)',
     'Chromium Linux',
     'Chromium Linux x64',
   ]
   results.extend(input_api.canned_checks.CheckBuildbotPendingBuilds(
       input_api,
       output_api,
       'http://build.chromium.org/buildbot/waterfall/json/builders?filter=1',
       6,
       IGNORED_BUILDERS))
   return results
 
 
 def GetPreferredTrySlaves():
   return ['win', 'linux', 'mac']