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Since 0467279e ("Reland "[Chromecast] Fix thread safety issues in
CastAudioJson."") we need to use a full task environment to avoid a CHECK
failure calling base::CreateSequencedTaskRunner().

Bug: 143135800
Test: cast_media_unittests
Change-Id: Ib07489414e4b13c74a7441a0f6d3fb4d73f6351c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1874808
Auto-Submit: Michael Spang <spang@chromium.org>
Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708635}