[ iOS BigSur ] http/tests/appcache/fail-on-update.html is a flaky timeout.

https://bugs.webkit.org/show_bug.cgi?id=227891

Unreviewed test gardening.

* platform/mac/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@283224 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Author: [email protected]

LayoutTests/ChangeLog

@@ -1,3 +1,12 @@
+2021-09-29  Ayumi Kojima  <[email protected]>
+
+        [ iOS BigSur ] http/tests/appcache/fail-on-update.html is a flaky timeout.
+        https://bugs.webkit.org/show_bug.cgi?id=227891
+
+        Unreviewed test gardening.
+
+        * platform/mac/TestExpectations:
+
 2021-09-29  Aditya Keerthi  <[email protected]>
 
         Update css-ui WPT

LayoutTests/platform/mac/TestExpectations

@@ -1924,6 +1924,8 @@ webkit.org/b/228189 http/tests/media/hls/hls-webvtt-seek-backwards.html [ Pass T
 
 webkit.org/b/230411 http/tests/media/hls/video-controller-getStartDate.html [ Pass Failure ]
 
+webkit.org/b/227891 http/tests/appcache/fail-on-update.html [ Pass Timeout DumpJSConsoleLogInStdErr ]
+
 # rdar://66660680 (REGRESSION (20A2327a-20A2348b): media/video-canvas-createPattern.html is failing)
 [ BigSur+ ] media/video-canvas-createPattern.html [ Failure ]