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

media/cast/net/udp_transport_unittest.cc

Index: media/cast/net/udp_transport_unittest.cc
diff --git a/media/cast/net/udp_transport_unittest.cc b/media/cast/net/udp_transport_unittest.cc
index 79d547be5a921782e904d10bc7a53c546f785768..0d895d34492a47aebc971850ebf0799bced03773 100644
--- a/media/cast/net/udp_transport_unittest.cc
+++ b/media/cast/net/udp_transport_unittest.cc
@@ -26,7 +26,7 @@ class MockPacketReceiver {
   MockPacketReceiver(const base::Closure& callback)
       : packet_callback_(callback) {}
 
-  bool ReceivedPacket(scoped_ptr<Packet> packet) {
+  bool ReceivedPacket(std::unique_ptr<Packet> packet) {
     packet_ = std::string(packet->size(), '\0');
     std::copy(packet->begin(), packet->end(), packet_.begin());
     packet_callback_.Run();