Don't assume we have a worker_thread_ on linux (for now)
Don't assume we have a worker_thread_ on linux (for now)

Tbr: d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org
No-Try: true
Bug: none
Change-Id: I0dca1e54b610b63651235a83ec80f0e7d76f51c4
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173085
Reviewed-by: Tommi <74a97831ec830b6e3846c6faa50560947ae01c68@webrtc.org>
Reviewed-by: Mirko Bonadei <d2c43c210eae6feef04f53bae50885e8152edcca@webrtc.org>
Commit-Queue: Tommi <74a97831ec830b6e3846c6faa50560947ae01c68@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#31019}

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