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This CL (temporarily) explicitly enable SignedExchanged* for web
tests. Two tests under external/wpt/signed-exchange/subresource are
rebaselined. virtual/sxg-subresource is removed.

This is to sepearte the change of web test expectations from
crrev.com/c/2375886 which will enable the feature for web tests by
adjusting the application order of blink feature status and chromium
feature status.

Bug: 1121839
Change-Id: I240be44a74a72604dcecc4aad34c0ca70a4e76e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2378738Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802444}