Rename FecConfig to UlpfecConfig in config.h.

webrtc/config.h

Index: webrtc/config.h
diff --git a/webrtc/config.h b/webrtc/config.h
index 0231cb56827500331329a8d4e6a5ecd2e3e0abfc..a6778715d87f634692a63b59aac64d3010ec73c6 100644
--- a/webrtc/config.h
+++ b/webrtc/config.h
@@ -35,10 +35,10 @@ struct NackConfig {
   int rtp_history_ms;
 };
 
-// Settings for forward error correction, see RFC 5109 for details. Set the
-// payload types to '-1' to disable.
-struct FecConfig {
-  FecConfig()
+// Settings for ULPFEC forward error correction.
+// Set the payload types to '-1' to disable.
+struct UlpfecConfig {
+  UlpfecConfig()
       : ulpfec_payload_type(-1),
         red_payload_type(-1),
         red_rtx_payload_type(-1) {}