Pass SdpAudioFormat through Channel, without converting to CodecInst

webrtc/modules/audio_coding/codecs/audio_format.h

Index: webrtc/modules/audio_coding/codecs/audio_format.h
diff --git a/webrtc/modules/audio_coding/codecs/audio_format.h b/webrtc/modules/audio_coding/codecs/audio_format.h
index 1199cc27cd39e26eb58599556d674c1a394ff956..5786662e556972a06ba080bb6e27c3b3756fafc7 100644
--- a/webrtc/modules/audio_coding/codecs/audio_format.h
+++ b/webrtc/modules/audio_coding/codecs/audio_format.h
@@ -26,10 +26,15 @@ struct SdpAudioFormat {
   SdpAudioFormat(const SdpAudioFormat&);
   SdpAudioFormat(SdpAudioFormat&&);
   SdpAudioFormat(const char* name, int clockrate_hz, int num_channels);
+  SdpAudioFormat(const std::string& name, int clockrate_hz, int num_channels);
   SdpAudioFormat(const char* name,
                  int clockrate_hz,
                  int num_channels,
                  Parameters&& param);
+  SdpAudioFormat(const std::string& name,
+                 int clockrate_hz,
+                 int num_channels,
+                 Parameters&& param);
   ~SdpAudioFormat();
 
   SdpAudioFormat& operator=(const SdpAudioFormat&);