Fix support with python 2.6 without simplejson.

trychange.py

 #!/usr/bin/python
 # Copyright (c) 2009 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 logging
 import optparse
 import os
 import posixpath
 import re
 import shutil
 import sys
 import tempfile
 import urllib
 
 try:
+  import simplejson as json
+except ImportError:
+  try:
+    import json
+  except ImportError:
+    json = None
+
+try:
   import breakpad
 except ImportError:
   pass
 
 import gclient_utils
 import scm
 
 __version__ = '1.2'
 
 
@@ skipping 580 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.
-      try:
-        import simplejson
-      except ImportError:
-        parser.error('simplejson library is missing, please install.')
+      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 = simplejson.loads(urllib.urlopen(api_url).read())
+      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)
     else:
       # Use this as the base.
       root = checkouts[0].checkout_root
       diffs = []
       for checkout in checkouts:
@@ skipping 53 matching lines @@
   except (InvalidScript, NoTryServerAccess), e:
     if swallow_exception:
       return 1
     print e
     return 1
   return 0
 
 
 if __name__ == "__main__":
   sys.exit(TryChange(None, [], False))