Convert //media/cast from scoped_ptr to std::unique_ptr

media/cast/net/rtcp/test_rtcp_packet_builder.h

Index: media/cast/net/rtcp/test_rtcp_packet_builder.h
diff --git a/media/cast/net/rtcp/test_rtcp_packet_builder.h b/media/cast/net/rtcp/test_rtcp_packet_builder.h
index 0235869ad718a74c632f7df30dc396e781830348..be4dcc00a501c03b59c3a9d54a8f7e204c524050 100644
--- a/media/cast/net/rtcp/test_rtcp_packet_builder.h
+++ b/media/cast/net/rtcp/test_rtcp_packet_builder.h
@@ -89,7 +89,7 @@ class TestRtcpPacketBuilder {
                            CastLoggingEvent event,
                            uint16_t event_timesamp_delta);
 
-  scoped_ptr<Packet> GetPacket();
+  std::unique_ptr<Packet> GetPacket();
   const uint8_t* Data();
   int Length() { return kMaxIpPacketSize - big_endian_writer_.remaining(); }
   base::BigEndianReader* Reader();