Mark external/wpt/dom/events/scrolling/scrollend-event-for-user-scroll.html as failing

TBR=schenney@chromium.org
NOTRY=true

Bug: 626703
Change-Id: I2c309e1f37776358b8058e3d94b0452b87870374
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2449929Reviewed-by: Chris Sharp <csharp@chromium.org>
Commit-Queue: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813720}

third_party/blink/web_tests/TestExpectations

@@ -2658,7 +2658,7 @@ crbug.com/626703 external/wpt/wasm/jsapi/functions/incumbent.html [ Crash ]
 crbug.com/626703 external/wpt/css/CSS2/normal-flow/min-height-applies-to-014.xht [ Failure ]
 crbug.com/626703 external/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-1.html [ Timeout ]
 crbug.com/626703 external/wpt/html/semantics/embedded-content/the-iframe-element/iframe_sandbox_allow_top_navigation-3.html [ Timeout ]
-crbug.com/626703 [ Mac ] external/wpt/dom/events/scrolling/scrollend-event-for-user-scroll.html [ Timeout ]
+crbug.com/626703 [ Mac ] external/wpt/dom/events/scrolling/scrollend-event-for-user-scroll.html [ Failure Timeout ]
 crbug.com/626703 [ Win ] external/wpt/dom/events/scrolling/scrollend-event-for-user-scroll.html [ Failure Timeout ]
 crbug.com/626703 external/wpt/webtransport/quic/client-indication.sub.any.html [ Timeout ]
 crbug.com/626703 [ Mac10.14 ] external/wpt/html/browsers/the-window-object/apis-for-creating-and-navigating-browsing-contexts-by-name/open-features-tokenization-screenx-screeny.html [ Timeout ]