Disabled flaky system health smoke test.

tools/perf/benchmarks/system_health_smoke_test.py

Index: tools/perf/benchmarks/system_health_smoke_test.py
diff --git a/tools/perf/benchmarks/system_health_smoke_test.py b/tools/perf/benchmarks/system_health_smoke_test.py
index cb99411a059c874b8f45d3b9e1df90405dadb45f..3d95293acb4e252f930c4b92ff629e9a6c3bcfbb 100644
--- a/tools/perf/benchmarks/system_health_smoke_test.py
+++ b/tools/perf/benchmarks/system_health_smoke_test.py
@@ -74,6 +74,8 @@ _DISABLED_TESTS = frozenset({
   'benchmarks.system_health_smoke_test.SystemHealthBenchmarkSmokeTest.system_health.memory_mobile.load:social:facebook', # pylint: disable=line-too-long
   'benchmarks.system_health_smoke_test.SystemHealthBenchmarkSmokeTest.system_health.memory_mobile.load:social:tumblr', # pylint: disable=line-too-long
   'benchmarks.system_health_smoke_test.SystemHealthBenchmarkSmokeTest.system_health.memory_mobile.load:social:pinterest', # pylint: disable=line-too-long
+  # crbug.com/725386
+  'benchmarks.system_health_smoke_test.SystemHealthBenchmarkSmokeTest.system_health.memory_desktop.browse:social:twitter', # pylint: disable=line-too-long
 })