Replace AudioSendStream::Config with rtclog::StreamConfig.

BUG=webrtc:7538

Review-Url: https://codereview.webrtc.org/2856063003
Cr-Original-Commit-Position: refs/heads/master@{#18224}
Cr-Mirrored-From: https://chromium.googlesource.com/external/webrtc
Cr-Mirrored-Commit: f472699bbd955062dcf1413316d0810eb3e2dea9
12 files changed