Do not proxy VideoSendStreamImpl::OnVideoLayersAllocationUpdated
Do not proxy VideoSendStreamImpl::OnVideoLayersAllocationUpdated

OnVideoLayersAllocationUpdated is handled on the encoder task queue in
order to not race with OnEncodedImage callbacks.

Bug: webrtc:12000
Change-Id: I1c9a450cce819a7a0f8827aa0bb675c37350a0c2
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/200880
Reviewed-by: Erik Språng <3ab8c90c99d6dd7822e0fad803ab0211dd287ae5@webrtc.org>
Commit-Queue: Per Kjellander <ec3efbb37602a1ca89f5fcf018e3a9e25086611a@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#32935}

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