Disable flaky...

Disable flaky SystemHealthBenchmarkSmokeTest.system_health.memory_desktop/play:media:soundcloud:2018

TBR=perezju@chromium.org

Bug: 987858
Change-Id: I7dbd4dc300f38c9aacad4a214a6618c8120e0dd5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722578Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681723}

tools/perf/benchmarks/system_health_smoke_test.py

@@ -76,6 +76,10 @@ _DISABLED_TESTS = frozenset({
   # crbug.com/769263
   'system_health.memory_desktop/play:media:soundcloud',
 
+  # crbug.com/987858
+  'system_health.memory_desktop/play:media:soundcloud:2018',
+
+
   # crbug.com/
   'system_health.memory_desktop/browse:news:nytimes',