Disable flaky test: MetricsCollectorTest.ResponsivenessMetric

Bug: 833028
Change-Id: Ie4d60d122f5403f735d8f5a0d9fe45f35f1e13c5
TBR: chrisha@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/1014100Reviewed-by: Ramin Halavati <rhalavati@chromium.org>
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550963}

services/resource_coordinator/observers/metrics_collector_unittest.cc

@@ -345,7 +345,8 @@ TEST_F(MAYBE_MetricsCollectorTest,
       kTabFromBackgroundedToFirstFaviconUpdatedUMA, 1);
 }
 
-TEST_F(MAYBE_MetricsCollectorTest, ResponsivenessMetric) {
+// Flaky test: https://crbug.com/833028
+TEST_F(MAYBE_MetricsCollectorTest, DISABLED_ResponsivenessMetric) {
   auto page_cu = CreateCoordinationUnit<PageCoordinationUnitImpl>();
   coordination_unit_manager().OnCoordinationUnitCreated(page_cu.get());
   auto process_cu = CreateCoordinationUnit<ProcessCoordinationUnitImpl>();