Remove python 2.5 compatibility code.

presubmit_canned_checks.py

 # 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.
 
 """Generic presubmit checks that can be reused by other presubmit checks."""
 
 
 ### Description checks
 
 def CheckChangeHasTestField(input_api, output_api):
@@ skipping 677 matching lines @@
 # TODO(dpranke): Get the host_url from the input_api instead
 def CheckRietveldTryJobExecution(input_api, output_api, host_url, platforms,
                                  owner):
   # Temporarily 'fix' the check while the Rietveld API is being upgraded to
   # something sensible.
   return []
 
 
 def CheckBuildbotPendingBuilds(input_api, output_api, url, max_pendings,
     ignored):
-  if not input_api.json:
-    return [output_api.PresubmitPromptWarning(
-      'Please install simplejson or upgrade to python 2.6+')]
   try:
     connection = input_api.urllib2.urlopen(url)
     raw_data = connection.read()
     connection.close()
   except IOError:
     return [output_api.PresubmitNotifyResult('%s is not accessible' % url)]
 
   try:
     data = input_api.json.loads(raw_data)
   except ValueError:
@@ skipping 227 matching lines @@
     results.extend(input_api.canned_checks.CheckSvnForCommonMimeTypes(
         input_api, output_api))
     snapshot("checking license")
     results.extend(input_api.canned_checks.CheckLicense(
         input_api, output_api, license_header, source_file_filter=sources))
     snapshot("checking was uploaded")
     results.extend(input_api.canned_checks.CheckChangeWasUploaded(
         input_api, output_api))
   snapshot("done")
   return results