Revert of Add the perceptual difference metric to the rebaseline server

gm/rebaseline_server/results.py

 #!/usr/bin/python
 
 """
 Copyright 2013 Google Inc.
 
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Repackage expected/actual GM results as needed by our HTML rebaseline viewer.
 """
@@ skipping 414 matching lines @@
           if expectations_per_test:
             for field in FIELDS_PASSED_THRU_VERBATIM:
               results_for_this_test[field] = expectations_per_test.get(field)
 
           if updated_result_type == gm_json.JSONKEY_ACTUALRESULTS_NOCOMPARISON:
             pass # no diff record to calculate at all
           elif updated_result_type == gm_json.JSONKEY_ACTUALRESULTS_SUCCEEDED:
             results_for_this_test['numDifferingPixels'] = 0
             results_for_this_test['percentDifferingPixels'] = 0
             results_for_this_test['weightedDiffMeasure'] = 0
-            results_for_this_test['perceptualDifference'] = 0
             results_for_this_test['maxDiffPerChannel'] = 0
           else:
             try:
               diff_record = self._image_diff_db.get_diff_record(
                   expected_image_locator=expected_image[1],
                   actual_image_locator=actual_image[1])
               results_for_this_test['numDifferingPixels'] = (
                   diff_record.get_num_pixels_differing())
               results_for_this_test['percentDifferingPixels'] = (
                   diff_record.get_percent_pixels_differing())
               results_for_this_test['weightedDiffMeasure'] = (
                   diff_record.get_weighted_diff_measure())
-              results_for_this_test['perceptualDifference'] = (
-                  diff_record.get_perceptual_difference())
               results_for_this_test['maxDiffPerChannel'] = (
                   diff_record.get_max_diff_per_channel())
             except KeyError:
               logging.warning('unable to find diff_record for ("%s", "%s")' %
                               (expected_image[1], actual_image[1]))
               pass
 
           Results._add_to_category_dict(categories_all, results_for_this_test)
           data_all.append(results_for_this_test)
 
@@ skipping 76 matching lines @@
       help='Directory within which to download images and generate diffs')
   args = parser.parse_args()
   results = Results(actuals_root=args.actuals,
                     expected_root=args.expectations,
                     generated_images_root=args.workdir)
   gm_json.WriteToFile(results.get_results_of_type(RESULTS_ALL), args.outfile)
 
 
 if __name__ == '__main__':
   main()