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Also fix unittest from last CL to test the desired code path.

BUG=internal b/110058717
TEST=cast_bluetooth_unittests, manual

Change-Id: Ib54c0627d90e7fb589e131e009298c362d25dbfd
Reviewed-on: https://chromium-review.googlesource.com/1096614
Commit-Queue: Bailey Forrest <bcf@chromium.org>
Reviewed-by: Stephen Lanham <slan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566623}