Update test expectations for new css-grid on mac

Bug: 1112771
Change-Id: I267f6cfd80ed05097ce5ee9777186e944ff1a6bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2333682Reviewed-by: Aaron Krajeski <aaronhk@chromium.org>
Reviewed-by: Kush Sinha <sinhak@chromium.org>
Commit-Queue: Aaron Krajeski <aaronhk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794528}

third_party/blink/web_tests/TestExpectations

@@ -6870,3 +6870,9 @@ crbug.com/1112111 fast/forms/month/month-picker-appearance-step.html [ Pass Fail
 crbug.com/1108423 external/wpt/referrer-policy/gen/worker-classic.http-rp/unset/worker-classic.http.html [ Pass Timeout ]
 crbug.com/1106429 virtual/percent-based-scrolling/max-percent-delta-page-zoom.html [ Pass Failure ]
 crbug.com/1112304 external/wpt/html/cross-origin-opener-policy/popup-coop-by-sw-from-coop.https.html [ Pass Timeout ]
+
+# Sheriff 2020-08-04: New wpt tests are failing
+crbug.com/1112771 external/wpt/css/css-grid/grid-definition/grid-template-columns-rows-resolved-values-001.tentative.html [ Failure ]
+crbug.com/1112771 external/wpt/css/css-grid/layout-algorithm/grid-flex-track-intrinsic-sizes-001.html [ Failure ]
+crbug.com/1112771 external/wpt/webhid/idlharness.https.window.html [ Failure ]
+crbug.com/1112771 external/wpt/css/css-grid/grid-definition/grid-inline-template-columns-rows-resolved-values-001.tentative.html [ Failure ]