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To test import maps without built-in module support.

In import-maps-without-builtin-modules virtual tests,
we skip wpt/import-maps/builtin-support/ tests because
all of them are about built-in modules, but
still run wpt/import-maps/imported/ tests because
they still contain subtests that can pass without
built-in modules/fallbacks.

Bug: 1010751
Change-Id: I9ca8b9d2d40a699819ff38f6d652b7dc4be1b079
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1841813
Commit-Queue: Hiroshige Hayashizaki <hiroshige@chromium.org>
Reviewed-by: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#706585}