Fix leak in AudioManager unit test.

Change-Id: Ifcfaab0706c1c758cb2c48936e1ae16d4162f0a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1602633
Auto-Submit: Max Morin <maxmorin@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#658087}
1 file changed