Disable multiple blink tests on Mac

The following tests are failing

virtual/form-controls-refresh-disabled/fast/forms/autofocus-opera-008.html
- Mac10.13 Tests, Mac10.12 Tests, Mac10.10 Tests
- https://ci.chromium.org/p/chromium/builders/ci/Mac10.13%20Tests/22747

virtual/threaded/fast/scroll-snap/snap-to-target-on-layout-change.html
- WebKit Mac10.13 (retina)
- https://ci.chromium.org/p/chromium/builders/ci/WebKit%20Mac10.13%20%28retina%29/25972

accessibility/content-changed-notification-causes-crash.html
- WebKit Mac10.13 (retina), Mac10.14 Tests
- https://ci.chromium.org/p/chromium/builders/ci/Mac10.14%20Tests/2203

Mentioning multiple Mac targets in the same line doesn't seem to work,
so I split them.

Tbr: tkent@chromium.org
Bug: 1058203, 1058073
Change-Id: I953c7c23a70f1e7431ba2e21272b314693c1def8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2087727Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Christian Dullweber <dullweber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747239}

third_party/blink/web_tests/TestExpectations

@@ -6752,3 +6752,11 @@ crbug.com/1058244 [ Mac ] virtual/compositor_threaded_scrollbar_scrolling/fast/s
 crbug.com/1058403 external/wpt/webaudio/the-audio-api/the-audioworklet-interface/suspended-context-messageport.https.html [ Failure ]
 
 crbug.com/1057020 [ Fuchsia ] http/tests/streams/chromium/get-reader-byob.html [ Pass Timeout ]
+
+# Sheriff 2020-03-05
+crbug.com/1058203 [ Mac10.13 ] virtual/form-controls-refresh-disabled/fast/forms/autofocus-opera-008.html [ Pass Failure ]
+crbug.com/1058203 [ Mac10.12 ] virtual/form-controls-refresh-disabled/fast/forms/autofocus-opera-008.html [ Pass Failure ]
+crbug.com/1058203 [ Mac10.10 ] virtual/form-controls-refresh-disabled/fast/forms/autofocus-opera-008.html [ Pass Failure ]
+crbug.com/1058073 [ Retina ] virtual/threaded/fast/scroll-snap/snap-to-target-on-layout-change.html [ Pass Failure ]
+crbug.com/1058073 [ Mac10.14 ] accessibility/content-changed-notification-causes-crash.html [ Pass Failure ]
+crbug.com/1058073 [ Retina ] accessibility/content-changed-notification-causes-crash.html [ Pass Failure ]
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