overscroll-event-fired-to-element-with-overscroll-behavior.html flaky

This test is flaking on the Linux Leak bot.

TBR=sahel@chromium.org

Bug: 1049599
Change-Id: I8c29b00080b380355fe56da5267189080c98df71
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2042083Reviewed-by: Robert Flack <flackr@chromium.org>
Reviewed-by: Sahel Sharify <sahel@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738985}

third_party/blink/web_tests/TestExpectations

@@ -2182,6 +2182,10 @@ crbug.com/991413 external/wpt/css/css-text/white-space/trailing-other-space-sepa
 crbug.com/991413 external/wpt/css/css-text/white-space/trailing-other-space-separators-break-spaces-014.html [ Skip ]
 crbug.com/991413 external/wpt/css/css-text/white-space/trailing-other-space-separators-break-spaces-015.html [ Skip ]
 
+# Sheriff 2020-02-06
+# Flaking on Linux Leak
+crbug.com/1049599 [ Linux ] virtual/threaded-prefer-compositing/fast/scrolling/events/overscroll-event-fired-to-element-with-overscroll-behavior.html [ Pass Failure ]
+
 # Sheriff 2019-08-19
 crbug.com/626703 [ Win7 ] external/wpt/xhr/responsexml-document-properties.htm [ Failure ]
 crbug.com/626703 [ Win7 ] external/wpt/html/dom/documents/resource-metadata-management/document-lastModified-01.html [ Failure ]