Fix compatibility for gcl-try/git-try with repos not using tryserver.chromium

trychange.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Client-side script to send a try job to the try server. It communicates to
 the try server by either writting to a svn repository or by directly connecting
 to the server by HTTP.
 """
 
@@ skipping 358 matching lines @@
     if not change:
       if not changed_files:
         changed_files = checkouts[0].file_tuples
       change = presubmit_support.Change(options.name,
                                         '',
                                         checkouts[0].checkout_root,
                                         changed_files,
                                         options.issue,
                                         options.patchset,
                                         options.email)
-    trybots = presubmit_support.DoGetTryMasters(
+    masters = presubmit_support.DoGetTryMasters(
         change,
         checkouts[0].GetFileNames(),
         checkouts[0].checkout_root,
         root_presubmit,
         options.project,
         options.verbose,
-        sys.stdout).get('tryserver.chromium', [])
+        sys.stdout)
+
+    # Compatibility for old checkouts and bots that were on tryserver.chromium.
+    trybots = masters.get('tryserver.chromium', [])
+
+    # Compatibility for checkouts that are not using tryserver.chromium
+    # but are stuck with git-try or gcl-try.
+    if not trybots and len(masters) == 1:
+      trybots = masters.values()[0]
+
     if trybots:
       old_style = filter(lambda x: isinstance(x, basestring), trybots)
       new_style = filter(lambda x: isinstance(x, tuple), trybots)
 
       # _ParseBotList's testfilter is set to None otherwise it will complain.
       bot_spec = _ApplyTestFilter(options.testfilter,
                                   _ParseBotList(old_style, None))
 
       bot_spec.extend(_ApplyTestFilter(options.testfilter, new_style))
 
@@ skipping 531 matching lines @@
     return 1
   except (gclient_utils.Error, subprocess2.CalledProcessError), e:
     print >> sys.stderr, e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   fix_encoding.fix_encoding()
   sys.exit(TryChange(None, None, False))