[Intl] Remove fixed tests.

TBR=jshin@chromium.org

Bug: v8:8469
Change-Id: I60f7868a19eec925a597f1355182c2fd8550a2d2
Reviewed-on: https://chromium-review.googlesource.com/c/1374990Reviewed-by: Frank Tang <ftang@chromium.org>
Commit-Queue: Frank Tang <ftang@chromium.org>
Commit-Queue: Jungshik Shin <jshin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58203}

test/test262/test262.status

@@ -586,9 +586,6 @@
   'intl402/NumberFormat/prototype/format/format-fraction-digits': [FAIL],
   'intl402/NumberFormat/prototype/format/format-significant-digits': [FAIL],
 
-  # https://bugs.chromium.org/p/v8/issues/detail?id=8469
-  'intl402/DateTimeFormat/ignore-invalid-unicode-ext-values': [FAIL],
-
   # https://bugs.chromium.org/p/v8/issues/detail?id=7482
   'intl402/DateTimeFormat/prototype/resolvedOptions/resolved-locale-with-hc-unicode': [FAIL],