Disable flaky system_health.memory_desktop/browse_accessibility:media:youtube

TBR=perezju@chromium.org

Bug: 983326
Change-Id: I22be996f9054935f378a05b95f7f7924a9c5f63b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699097Reviewed-by: danakj <danakj@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#677130}

tools/perf/benchmarks/system_health_smoke_test.py

@@ -34,6 +34,9 @@ def GetSystemHealthBenchmarksToSmokeTest():
 
 
 _DISABLED_TESTS = frozenset({
+  # crbug.com/983326 - flaky.
+  'system_health.memory_desktop/browse_accessibility:media:youtube',
+
   # crbug.com/878390 - These stories are already covered by their 2018 versions
   # and will later be removed.
   'system_health.memory_mobile/browse:tech:discourse_infinite_scroll',