Update custom-properties/ layout test expectations on Mac

third_party/WebKit/LayoutTests/TestExpectations

Index: third_party/WebKit/LayoutTests/TestExpectations
diff --git a/third_party/WebKit/LayoutTests/TestExpectations b/third_party/WebKit/LayoutTests/TestExpectations
index 97a504c829ae09445b316e01ca707e656c5269c1..2a616372389924fea1818dc4f17d7faf9174fd95 100644
--- a/third_party/WebKit/LayoutTests/TestExpectations
+++ b/third_party/WebKit/LayoutTests/TestExpectations
@@ -2650,10 +2650,6 @@ crbug.com/696407 [ Linux ] external/wpt/html/browsers/history/the-location-inter
 crbug.com/694338 [ Mac10.9 ] fast/forms/calendar-picker/calendar-picker-appearance-zoom125.html [ Failure ]
 crbug.com/694338 [ Mac10.9 ] fast/forms/calendar-picker/calendar-picker-appearance-zoom200.html [ Failure ]
 
-# Sheriff failures 2017-02-28
-crbug.com/707816 [ Mac ] custom-properties/register-property-syntax-parsing.html [ Failure ]
-crbug.com/696903 [ Mac ] custom-properties/register-property.html [ Crash ]
-
 crbug.com/697087 external/wpt/service-workers/service-worker/registration-iframe.https.html [ Pass Timeout ]
 
 crbug.com/697342 http/tests/push_messaging/permission-state-granted-in-document.html [ Pass Failure ]