Remove python 2.5 compatibility code.

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.
 """
 
 import datetime
 import errno
 import getpass
+import json
 import logging
 import optparse
 import os
 import posixpath
 import re
 import shutil
 import sys
 import tempfile
 import urllib
 
-try:
-  import simplejson as json  # pylint: disable=F0401
-except ImportError:
-  try:
-    import json  # pylint: disable=F0401
-  except ImportError:
-    # Import the one included in depot_tools.
-    sys.path.append(os.path.join(os.path.dirname(__file__), 'third_party'))
-    import simplejson as json  # pylint: disable=F0401
-
 import breakpad  # pylint: disable=W0611
 
 import gcl
 import fix_encoding
 import gclient_utils
 import scm
 import subprocess2
 
 
 __version__ = '1.2'
@@ skipping 693 matching lines @@
       if options.files:
         parser.error('You cannot specify files and --url at the same time.')
       options.diff = urllib.urlopen(options.url).read()
     elif options.diff:
       if options.files:
         parser.error('You cannot specify files and --diff at the same time.')
       options.diff = gclient_utils.FileRead(options.diff, 'rb')
     elif options.issue and options.patchset is None:
       # Retrieve the patch from rietveld when the diff is not specified.
       # When patchset is specified, it's because it's done by gcl/git-try.
-      if json is None:
-        parser.error('json or simplejson library is missing, please install.')
       api_url = '%s/api/%d' % (options.rietveld_url, options.issue)
       logging.debug(api_url)
       contents = json.loads(urllib.urlopen(api_url).read())
       options.patchset = contents['patchsets'][-1]
       diff_url = ('%s/download/issue%d_%d.diff' %
           (options.rietveld_url,  options.issue, options.patchset))
       diff = GetMungedDiff('', urllib.urlopen(diff_url).readlines())
       options.diff = ''.join(diff[0])
       changed_files = diff[1]
     else:
@@ skipping 89 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))