Rename FecReceiver to UlpfecReceiver.

BUG=webrtc:5654

Review-Url: https://codereview.webrtc.org/2451643002
Cr-Commit-Position: refs/heads/master@{#14846}
diff --git a/webrtc/modules/rtp_rtcp/include/flexfec_receiver.h b/webrtc/modules/rtp_rtcp/include/flexfec_receiver.h
index 8f672fc..fa1c853 100644
--- a/webrtc/modules/rtp_rtcp/include/flexfec_receiver.h
+++ b/webrtc/modules/rtp_rtcp/include/flexfec_receiver.h
@@ -14,7 +14,7 @@
 #include <memory>
 
 #include "webrtc/base/basictypes.h"
-#include "webrtc/modules/rtp_rtcp/include/fec_receiver.h"
+#include "webrtc/modules/rtp_rtcp/include/ulpfec_receiver.h"
 
 namespace webrtc {