Fixing video loopback test with encoder factory.

webrtc/audio/audio_send_stream.cc

Index: webrtc/audio/audio_send_stream.cc
diff --git a/webrtc/audio/audio_send_stream.cc b/webrtc/audio/audio_send_stream.cc
index d413a962b70dcbc9c36c81b0035b3ada98d87fa1..e95c5e717c58643bfb1d74aebe835c3d70c02bc5 100644
--- a/webrtc/audio/audio_send_stream.cc
+++ b/webrtc/audio/audio_send_stream.cc
@@ -388,6 +388,8 @@ bool AudioSendStream::SetupSendCodec(AudioSendStream* stream,
                                      const Config& new_config) {
   RTC_DCHECK(new_config.send_codec_spec);
   const auto& spec = *new_config.send_codec_spec;
+
+  RTC_DCHECK(new_config.encoder_factory);

[ossu, 2017/05/09 15:45:41]

Might as well move this one just below the check on line 389.

   std::unique_ptr<AudioEncoder> encoder =
       new_config.encoder_factory->MakeAudioEncoder(spec.payload_type,
                                                    spec.format);