Temporarily disable reference testing on Mac builders".

This is to validate whether they are causing the failures

Bug: 868675
Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: I3ccdb25614fbfddfc77224b3df9314a79970fc57
Reviewed-on: https://chromium-review.googlesource.com/1163638
Commit-Queue: Ned Nguyen <nednguyen@google.com>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580909}

testing/buildbot/chromium.perf.json

@@ -1549,7 +1549,6 @@
           "-v",
           "--browser=release",
           "--upload-results",
-          "--run-ref-build",
           "--test-shard-map-filename=mac_1012_low_end_26_shard_map.json",
           "--assert-gpu-compositing"
         ],
@@ -1684,7 +1683,6 @@
           "-v",
           "--browser=release",
           "--upload-results",
-          "--run-ref-build",
           "--test-shard-map-filename=mac_1013_high_end_26_shard_map.json",
           "--assert-gpu-compositing"
         ],

tools/perf/core/perf_data_generator.py

@@ -480,7 +480,7 @@ NEW_PERF_RECIPE_MIGRATED_TESTERS = {
           'isolate': 'performance_test_suite',
           'num_shards': 26,
           'extra_args': [
-              '--run-ref-build',
+              # '--run-ref-build', crbug.com/868675
               '--test-shard-map-filename=mac_1012_low_end_26_shard_map.json',
               '--assert-gpu-compositing',
           ],
@@ -548,7 +548,7 @@ NEW_PERF_RECIPE_MIGRATED_TESTERS = {
         {
           'isolate': 'performance_test_suite',
           'extra_args': [
-            '--run-ref-build',
+            # '--run-ref-build', crbug.com/868675
             '--test-shard-map-filename=mac_1013_high_end_26_shard_map.json',
               '--assert-gpu-compositing',
           ],