Remove ChannelSendState
Remove ChannelSendState

Also remove an unnecessary call to ACM::InitializeReceiver().

Bug: webrtc:9801
Change-Id: I68034f2673f47ecf7dcf1a3be198f240fea54f82
Reviewed-on: https://webrtc-review.googlesource.com/c/111251
Reviewed-by: Niels Moller <0057859e47d61d90529d0f66d9ef692cefedb46a@webrtc.org>
Commit-Queue: Fredrik Solenberg <a86c06127c44de4932e34935a0755af178aabab6@webrtc.org>
Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#25693}
ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc,ShiftMediaProject/libilbc,TimothyGu/libilbc,ShiftMediaProject/libilbc