Ignore case in tree status check

BUG=chromium-os:2308

Review URL: http://codereview.chromium.org/2337003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@48488 0039d316-1c4b-4281-b951-d872f2087c98

presubmit_canned_checks.py

@@ -350,7 +350,7 @@ def CheckTreeIsOpen(input_api, output_api, url, closed):
     connection = input_api.urllib2.urlopen(url)
     status = connection.read()
     connection.close()
-    if input_api.re.match(closed, status):
+    if input_api.re.match(closed, status, input_api.re.IGNORECASE):
       long_text = status + '\n' + url
       return [output_api.PresubmitError('The tree is closed dude!',
                                         long_text=long_text)]