Reimplement the builtin audio codec factories using the new stuff in api/

webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc

Index: webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc
diff --git a/webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc b/webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc
index b3053ef471a6df87b3e0e8ce80fac28db693b7a6..dc1775189eb425a2cd64c43ec18d022cb0c19b9a 100644
--- a/webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc
+++ b/webrtc/api/audio_codecs/ilbc/audio_decoder_ilbc.cc
@@ -21,7 +21,7 @@ namespace webrtc {
 
 rtc::Optional<AudioDecoderIlbc::Config> AudioDecoderIlbc::SdpToConfig(
     const SdpAudioFormat& format) {
-  return STR_CASE_CMP(format.name.c_str(), "ilbc") == 0 &&
+  return STR_CASE_CMP(format.name.c_str(), "ILBC") == 0 &&
                  format.clockrate_hz == 8000 && format.num_channels == 1
              ? rtc::Optional<Config>(Config())
              : rtc::Optional<Config>();