Fix PRESUBMIT.py erros on uploading DEPS change.

PRESUBMIT.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.
 
 """Top-level presubmit script for Chromium.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details about the presubmit API built into depot_tools.
 """
 
@@ skipping 1048 matching lines @@
           'This is a dry run, skipping OWNERS check for DEPS additions')]
     if not input_api.change.issue:
       return [output_api.PresubmitError(
           "DEPS approval by OWNERS check failed: this change has "
           "no Rietveld issue number, so we can't check it for approvals.")]
     output = output_api.PresubmitError
   else:
     output = output_api.PresubmitNotifyResult
 
   owners_db = input_api.owners_db
-  owner_email, reviewers = input_api.canned_checks._RietveldOwnerAndReviewers(
-      input_api,
-      owners_db.email_regexp,
-      approval_needed=input_api.is_committing)
+  owner_email, reviewers = (
+      input_api.canned_checks.GetCodereviewOwnerAndReviewers(
+        input_api,
+        owners_db.email_regexp,
+        approval_needed=input_api.is_committing))
 
   owner_email = owner_email or input_api.change.author_email
 
   reviewers_plus_owner = set(reviewers)
   if owner_email:
     reviewers_plus_owner.add(owner_email)
   missing_files = owners_db.files_not_covered_by(virtual_depended_on_files,
                                                  reviewers_plus_owner)
 
   # We strip the /DEPS part that was added by
@@ skipping 1039 matching lines @@
   results.extend(input_api.canned_checks.CheckTreeIsOpen(
       input_api,
       output_api,
       json_url='http://chromium-status.appspot.com/current?format=json'))
 
   results.extend(input_api.canned_checks.CheckChangeHasBugField(
       input_api, output_api))
   results.extend(input_api.canned_checks.CheckChangeHasDescription(
       input_api, output_api))
   return results