Revert of Removed the legacy behavior of stopping playout when setting new receive codecs.

webrtc/media/engine/webrtcvoiceengine.cc

Index: webrtc/media/engine/webrtcvoiceengine.cc
diff --git a/webrtc/media/engine/webrtcvoiceengine.cc b/webrtc/media/engine/webrtcvoiceengine.cc
index 9636ff32fc4fc98a21402e6d11c4d1433da6ed10..71803cbee38c845e1cf4afbfa90c15ca94f062e3 100644
--- a/webrtc/media/engine/webrtcvoiceengine.cc
+++ b/webrtc/media/engine/webrtcvoiceengine.cc
@@ -1705,6 +1705,12 @@
     return true;
   }
 
+  if (playout_) {
+    // Receive codecs can not be changed while playing. So we temporarily
+    // pause playout.
+    ChangePlayout(false);
+  }
+
   bool result = true;
   for (const AudioCodec& codec : new_codecs) {
     webrtc::CodecInst voe_codec = {0};
@@ -1729,6 +1735,9 @@
     recv_codecs_ = codecs;
   }
 
+  if (desired_playout_ && !playout_) {
+    ChangePlayout(desired_playout_);
+  }
   return result;
 }
 
@@ -1983,7 +1992,12 @@
 }
 
 void WebRtcVoiceMediaChannel::SetPlayout(bool playout) {
-  TRACE_EVENT0("webrtc", "WebRtcVoiceMediaChannel::SetPlayout");
+  desired_playout_ = playout;
+  return ChangePlayout(desired_playout_);
+}
+
+void WebRtcVoiceMediaChannel::ChangePlayout(bool playout) {
+  TRACE_EVENT0("webrtc", "WebRtcVoiceMediaChannel::ChangePlayout");
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   if (playout_ == playout) {
     return;