[tools/perf] Remove support for obsolete 'artifacts' field

Bug: 1011813
Change-Id: I189ba4170b762e28a2de6e42969e0f2bf778d959
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1856518Reviewed-by: Juan Antonio Navarro Pérez <perezju@chromium.org>
Commit-Queue: Mikhail Khokhlov <khokhlov@google.com>
Cr-Commit-Position: refs/heads/master@{#705913}

tools/perf/core/results_processor/processor.py

@@ -96,10 +96,6 @@ def _LoadIntermediateResults(intermediate_file):
         results['benchmarkRun'].update(record['benchmarkRun'])
       if 'testResult' in record:
         test_result = record['testResult']
-        # TODO(crbug.com/1011813): This is for compatibility with old version
-        # of LUCI format. Remove it when Telemetry switches to a new version.
-        if 'artifacts' in test_result:
-          test_result['outputArtifacts'] = test_result.pop('artifacts')
         results['testResults'].append(test_result)
   return results