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Migrate message pipe browser tests from MediaApp.

Bug: b:159927590
Change-Id: Icc3d4d759bce94a739a6fe0b56c85129c5b58b2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2282597
Commit-Queue: Oleh Lamzin <lamzin@google.com>
Reviewed-by: Trent Apted <tapted@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789231}