GitLab

Previously FuchsiaDecryptor was destroying FuchsiaClearStreamDecryptor
in the destructor which may run on a thread that's different than the
thread on which FuchsiaClearStreamDecryptor was created. Updated
FuchsiaDecryptor destructor to delete audio_decryptor_ asynchronously
on the right thread.

Bug: 1047783
Change-Id: I9c4dc5d7a292078eb632c0c44be6a68cc949b7e6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2033813
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738277}