Remove unnecessary redefinition of PacketLists in rtp_fec_unittest.

webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc
index 80f961bd1eb99876c3879e8ed70195830bee9eaf..228c19fe4c6334ca6325fc00f016faa19574e343 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_fec_unittest.cc
@@ -26,9 +26,9 @@ const uint8_t kTransportOverhead = 28;
 // Maximum number of media packets used in the FEC (RFC 5109).
 const uint8_t kMaxNumberMediaPackets = ForwardErrorCorrection::kMaxMediaPackets;
 
-typedef std::list<ForwardErrorCorrection::Packet*> PacketList;
-typedef std::list<ForwardErrorCorrection::ReceivedPacket*> ReceivedPacketList;
-typedef std::list<ForwardErrorCorrection::RecoveredPacket*> RecoveredPacketList;
+using PacketList = ForwardErrorCorrection::PacketList;
+using ReceivedPacketList = ForwardErrorCorrection::ReceivedPacketList;
+using RecoveredPacketList = ForwardErrorCorrection::RecoveredPacketList;
 
 template <typename T> void ClearList(std::list<T*>* my_list) {
   T* packet = NULL;