I've ensured that this failure is not due to ICU version.
We need to pass "nu".
Created attachment 403346 [details] Patch
Created attachment 403347 [details] Patch
Comment on attachment 403347 [details] Patch r=me.
ios-wk2's failure is happening without this patch. win EWS is broken now.
Committed r263837: <https://trac.webkit.org/changeset/263837>
<rdar://problem/65024738>
Committed r263849: <https://trac.webkit.org/changeset/263849>