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Previously audio and video decryptor creation logic was not consistent:
audio stream decryptor was created in FuchsiaClearStreamDecryptor::Create(),
while video stream decryptor is allocated in FuchsiaCdm. This CL removes
Create() from FuchsiaClearStreamDecryptor and adds

FuchsiaCdm: :CreateAudioDecryptor().
Change-Id: I17b4ad0d9e8b0949de9951ec2534c15f678d2e90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531053
Auto-Submit: Sergey Ulanov <sergeyu@chromium.org>
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Reviewed-by: David Dorwin <ddorwin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826168}