Stop running tests on Mac FYI Experimental bots.

Since they currently run the same OS version as the Release bots.

TBR=kbr

Bug: 1005378
Change-Id: I20fc3b846c4e1622a48207aca732cc539d1d607d
No-try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1809991
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697786}

testing/buildbot/waterfalls.pyl

@@ -2857,9 +2857,11 @@
           'limited_capacity_bot',
           'mac_mini_intel_gpu_experimental',
         ],
+        # Currently the experimental driver is identical to the stable
+        # driver. If it's upgraded, change these test_suites to be the same as
+        # 'Mac FYI Release (Intel)'.
         'test_suites': {
-          'gtest_tests': 'gpu_fyi_mac_release_gtests',
-          'gpu_telemetry_tests': 'gpu_fyi_mac_release_telemetry_tests',
+          'gpu_telemetry_tests': 'gpu_noop_sleep_telemetry_test',
         },
       },
       'Mac FYI Experimental Retina Release (AMD)': {
@@ -2869,9 +2871,11 @@
           'limited_capacity_bot',
           'mac_retina_amd_gpu_experimental',
         ],
+        # Currently the experimental driver is identical to the stable
+        # driver. If it's upgraded, change these test_suites to be the same as
+        # 'Mac FYI Retina Release (AMD)'.
         'test_suites': {
-          'gtest_tests': 'gpu_fyi_mac_release_gtests',
-          'gpu_telemetry_tests': 'gpu_fyi_mac_release_telemetry_tests',
+          'gpu_telemetry_tests': 'gpu_noop_sleep_telemetry_test',
         },
       },
       'Mac FYI Experimental Retina Release (NVIDIA)': {
@@ -2881,9 +2885,11 @@
           'limited_capacity_bot',
           'mac_retina_nvidia_gpu_experimental',
         ],
+        # Currently the experimental driver is identical to the stable
+        # driver. If it's upgraded, change these test_suites to be the same as
+        # 'Mac FYI Retina Release (NVIDIA)'.
         'test_suites': {
-          'gtest_tests': 'gpu_fyi_mac_release_gtests',
-          'gpu_telemetry_tests': 'gpu_fyi_mac_release_telemetry_tests',
+          'gpu_telemetry_tests': 'gpu_noop_sleep_telemetry_test',
         },
       },
       'Mac FYI GPU ASAN Release': {