Cast: cancel re-sending if a later nack packet says the receiver doesn't want it anymore

media/cast/rtcp/rtcp_unittest.cc

Index: media/cast/rtcp/rtcp_unittest.cc
diff --git a/media/cast/rtcp/rtcp_unittest.cc b/media/cast/rtcp/rtcp_unittest.cc
index f864a0034fa9d4de2d87f2ec0973b4f3c348764d..3cae9b9fea67f71b27acb57b5ca28c24ae81df55 100644
--- a/media/cast/rtcp/rtcp_unittest.cc
+++ b/media/cast/rtcp/rtcp_unittest.cc
@@ -108,6 +108,10 @@ class LocalRtcpTransport : public transport::PacedPacketSender {
     return false;
   }
 
+  virtual void CancelSendingPacket(
+      const transport::PacketKey& packet_key) OVERRIDE {
+  }
+
  private:
   bool drop_packets_;
   bool short_delay_;