Adjusting expectations for video-colorspace-yuv420.html

TBR=foolip@chromium.org

Bug: 1044567
Change-Id: Id058aefb9b62f35fbdbd638918da8370d7a0f126
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2013249
Commit-Queue: Olga Sharonova <olka@chromium.org>
Reviewed-by: Olga Sharonova <olka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733977}

third_party/blink/web_tests/TestExpectations

@@ -6303,3 +6303,7 @@ crbug.com/1042688 http/tests/devtools/elements/highlight/highlight-dom-updates.j
 # Sheriff 2020-01-20
 crbug.com/1043357 http/tests/credentialmanager/credentialscontainer-get-with-virtual-authenticator.html [ Pass Timeout Failure ]
 crbug.com/1043774 [ Linux ] virtual/web-components-v0-disabled/external/wpt/html/dom/reflection-grouping.html [ Pass Failure ]
+
+# Sheriff 2020-01-22
+crbug.com/1044567 [ Mac10.10 ] media/video-colorspace-yuv420.html [ Pass Failure ]
+crbug.com/1044567 [ Mac10.10 ] virtual/audio-service/media/video-colorspace-yuv420.html [ Pass Failure ]