Revert of Don't set the priority of the decoder to 'high' on Android. (patchset #1 id:1 of https://codereview.webrtc.org/2745813003/ )
Revert of Don't set the priority of the decoder to 'high' on Android. (patchset #1 id:1 of https://codereview.webrtc.org/2745813003/ )

Reason for revert:
Reverting this as it had no effect.

Original issue's description:
> Don't set the priority of the decoder to 'high' on Android.
> Doing so competes with the actual decoding that happens on a different thread.
>
> BUG=695438
>
> Review-Url: https://codereview.webrtc.org/2745813003
> Cr-Commit-Position: refs/heads/master@{#17184}
> Committed: https://chromium.googlesource.com/external/webrtc/+/ca37cf669174184b5139ffd0141bf7f6c0fc7894

TBR=stefan@webrtc.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=695438

Review-Url: https://codereview.webrtc.org/2757733005
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#17297}

TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc