Cast: Let the extension control if DSCP is on or off.

media/cast/net/cast_transport_sender_impl_unittest.cc

Index: media/cast/net/cast_transport_sender_impl_unittest.cc
diff --git a/media/cast/net/cast_transport_sender_impl_unittest.cc b/media/cast/net/cast_transport_sender_impl_unittest.cc
index 51945b4df3b90c739206cb0341f7a759e3d24b79..204cfdaf90642c2af1f6098152db8bdbef201fcf 100644
--- a/media/cast/net/cast_transport_sender_impl_unittest.cc
+++ b/media/cast/net/cast_transport_sender_impl_unittest.cc
@@ -81,6 +81,7 @@ class CastTransportSenderImplTest : public ::testing::Test {
         new CastTransportSenderImpl(NULL,
                                     &testing_clock_,
                                     net::IPEndPoint(),
+                                    "",
                                     base::Bind(&UpdateCastTransportStatus),
                                     BulkRawEventsCallback(),
                                     base::TimeDelta(),
@@ -94,6 +95,7 @@ class CastTransportSenderImplTest : public ::testing::Test {
         NULL,
         &testing_clock_,
         net::IPEndPoint(),
+        "",
         base::Bind(&UpdateCastTransportStatus),
         base::Bind(&CastTransportSenderImplTest::LogRawEvents,
                    base::Unretained(this)),