Cast: Deduplicate packets in paced sender and always send older packets first

media/cast/transport/pacing/mock_paced_packet_sender.h

Index: media/cast/transport/pacing/mock_paced_packet_sender.h
diff --git a/media/cast/transport/pacing/mock_paced_packet_sender.h b/media/cast/transport/pacing/mock_paced_packet_sender.h
index 62b33b7045213c618c1fc66efb558474bd81ec3a..8fb3f9f1c63ee811cd169b852d5a1e8b55e71cce 100644
--- a/media/cast/transport/pacing/mock_paced_packet_sender.h
+++ b/media/cast/transport/pacing/mock_paced_packet_sender.h
@@ -17,9 +17,9 @@ class MockPacedPacketSender : public PacedPacketSender {
   MockPacedPacketSender();
   virtual ~MockPacedPacketSender();
 
-  MOCK_METHOD1(SendPackets, bool(const PacketList& packets));
-  MOCK_METHOD1(ResendPackets, bool(const PacketList& packets));
-  MOCK_METHOD1(SendRtcpPacket, bool(PacketRef packet));
+  MOCK_METHOD1(SendPackets, bool(const SendPacketVector& packets));
+  MOCK_METHOD1(ResendPackets, bool(const SendPacketVector& packets));
+  MOCK_METHOD2(SendRtcpPacket, bool(unsigned int ssrc, PacketRef packet));
 };
 
 }  // namespace transport