Remove old compatibility for git_cl_upload branches.

git_cl.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.
 
 # Copyright (C) 2008 Evan Martin <martine@danga.com>
 
 """A git-command for integrating reviews on Rietveld and Gerrit."""
 
 from __future__ import print_function
@@ skipping 2383 matching lines @@
     # We assume the remote called "origin" is the one we want.
     # It is probably not worthwhile to support different workflows.
     gerrit_remote = 'origin'
 
     remote, remote_branch = self.GetRemoteBranch()
     branch = GetTargetRef(remote, remote_branch, options.target_branch,
                           pending_prefix='')
 
     if options.squash:
       self._GerritCommitMsgHookCheck(offer_removal=not options.force)
-      if not self.GetIssue():
-        # TODO(tandrii): deperecate this after 2016Q2.  Backwards compatibility
-        # with shadow branch, which used to contain change-id for a given
-        # branch, using which we can fetch actual issue number and set it as the
-        # property of the branch, which is the new way.
-        message = RunGitSilent([
-            'show', '--format=%B', '-s',
-            'refs/heads/git_cl_uploads/%s' % self.GetBranch()])
-        if message:
-          change_ids = git_footers.get_footer_change_id(message.strip())
-          if change_ids and len(change_ids) == 1:
-            details = self._GetChangeDetail(issue=change_ids[0])
-            if details:
-              print('WARNING: found old upload in branch git_cl_uploads/%s '
-                    'corresponding to issue %s' %
-                    (self.GetBranch(), details['_number']))
-              self.SetIssue(details['_number'])
-          if not self.GetIssue():
-            DieWithError(
-                '\n'  # For readability of the blob below.
-                'Found old upload in branch git_cl_uploads/%s, '
-                'but failed to find corresponding Gerrit issue.\n'
-                'If you know the issue number, set it manually first:\n'
-                '    git cl issue 123456\n'
-                'If you intended to upload this CL as new issue, '
-                'just delete or rename the old upload branch:\n'
-                '    git rename-branch git_cl_uploads/%s old_upload-%s\n'
-                'After that, please run git cl upload again.' %
-                tuple([self.GetBranch()] * 3))
-        # End of backwards compatability.
-
       if self.GetIssue():
         # Try to get the message from a previous upload.
         message = self.GetDescription()
         if not message:
           DieWithError(
               'failed to fetch description from current Gerrit issue %d\n'
               '%s' % (self.GetIssue(), self.GetIssueURL()))
         change_id = self._GetChangeDetail()['change_id']
         while True:
           footer_change_ids = git_footers.get_footer_change_id(message)
@@ skipping 2634 matching lines @@
 if __name__ == '__main__':
   # These affect sys.stdout so do it outside of main() to simplify mocks in
   # unit testing.
   fix_encoding.fix_encoding()
   setup_color.init()
   try:
     sys.exit(main(sys.argv[1:]))
   except KeyboardInterrupt:
     sys.stderr.write('interrupted\n')
     sys.exit(1)