imported/w3c/web-platform-tests/IndexedDB/blob-valid-before-commit.any.html

this test is a flaky failure on Mac and iOS

Diff:
--- /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/IndexedDB/blob-valid-before-commit.any-expected.txt
+++ /Volumes/Data/slave/catalina-release-tests-wk1/build/layout-test-results/imported/w3c/web-platform-tests/IndexedDB/blob-valid-before-commit.any-actual.txt
@@ -1,3 +1,10 @@
+CONSOLE MESSAGE: Unhandled Promise Rejection: NotFoundError: The object can not be found here.
 
-PASS Blobs can be read back before their records are committed. 
+Harness Error (FAIL), message = Unhandled rejection: The object can not be found here.
 
+TIMEOUT Blobs can be read back before their records are committed. Test timed out
+
+Harness Error (FAIL), message = Unhandled rejection: The object can not be found here.
+
+TIMEOUT Blobs can be read back before their records are committed. Test timed out
+

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2FIndexedDB%2Fblob-valid-before-commit.any.html

I am not able to reproduce the failure here but was able to reproduce a timeout using command:
run-webkit-tests --iterations 2000 --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f imported/w3c/web-platform-tests/IndexedDB/blob-valid-before-commit.any.html