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

media/cast/net/pacing/paced_sender_unittest.cc

Index: media/cast/net/pacing/paced_sender_unittest.cc
diff --git a/media/cast/net/pacing/paced_sender_unittest.cc b/media/cast/net/pacing/paced_sender_unittest.cc
index dda0e135df5f8c9aaa4d2cb3c31ceaf005d3a17f..e97c8329e8033ef55a5f7cb2abdbd724a630b7f1 100644
--- a/media/cast/net/pacing/paced_sender_unittest.cc
+++ b/media/cast/net/pacing/paced_sender_unittest.cc
@@ -170,7 +170,7 @@ class PacedSenderTest : public ::testing::Test {
   base::SimpleTestTickClock testing_clock_;
   TestPacketSender mock_transport_;
   scoped_refptr<FakeSingleThreadTaskRunner> task_runner_;
-  scoped_ptr<PacedSender> paced_sender_;
+  std::unique_ptr<PacedSender> paced_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(PacedSenderTest);
 };