Relax requirement to run web tests on Mac 10.13 bots with GPUs.

The tests pass with and without GPUs and this will slightly improve
utilization and pending times.

Bug: 1115109

Change-Id: I33f026dac158f124581c14e5bc2ae419123a7d4f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2294092
Reviewed-by: Dirk Pranke <[email protected]>
Commit-Queue: Erik Staab <[email protected]>
Cr-Commit-Position: refs/heads/master@{#801596}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index 7c58b5a..1d49287 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -175,9 +175,7 @@
         'swarming': {
           'dimension_sets': [
             {
-              # Run the layout tests on a consistent set of hardware
-              # (Mac Minis).
-              'gpu': '8086:0a2e',
+              'gpu': None,
             },
           ],
           'shards': 25,