Add send-side BWE to WebRtcVoiceEngine under a finch experiment.

talk/media/base/codec.cc

Index: talk/media/base/codec.cc
diff --git a/talk/media/base/codec.cc b/talk/media/base/codec.cc
index 59708b37dde6e75ac6a4b7657509729725d6d3d8..1dd01e43b43af2b14e535c3723a9cdd87edf97a8 100644
--- a/talk/media/base/codec.cc
+++ b/talk/media/base/codec.cc
@@ -326,17 +326,17 @@ std::string DataCodec::ToString() const {
   return os.str();
 }
 
-bool HasNack(const VideoCodec& codec) {
+bool HasNack(const Codec& codec) {
   return codec.HasFeedbackParam(
       FeedbackParam(kRtcpFbParamNack, kParamValueEmpty));
 }
 
-bool HasRemb(const VideoCodec& codec) {
+bool HasRemb(const Codec& codec) {
   return codec.HasFeedbackParam(
       FeedbackParam(kRtcpFbParamRemb, kParamValueEmpty));
 }
 
-bool HasTransportCc(const VideoCodec& codec) {
+bool HasTransportCc(const Codec& codec) {
   return codec.HasFeedbackParam(
       FeedbackParam(kRtcpFbParamTransportCc, kParamValueEmpty));
 }