EDK: Add a MakeUnique and use it somewhere.

mojo/edk/system/endpoint_relayer_unittest.cc

Index: mojo/edk/system/endpoint_relayer_unittest.cc
diff --git a/mojo/edk/system/endpoint_relayer_unittest.cc b/mojo/edk/system/endpoint_relayer_unittest.cc
index 8cc9b23d8e3fefcc80963b4fdb9fd1dc43e6ff44..9760b63167d560758046860a8e363138eeae4e04 100644
--- a/mojo/edk/system/endpoint_relayer_unittest.cc
+++ b/mojo/edk/system/endpoint_relayer_unittest.cc
@@ -9,6 +9,7 @@
 #include "base/test/test_timeouts.h"
 #include "mojo/edk/system/channel_endpoint_id.h"
 #include "mojo/edk/system/channel_test_base.h"
+#include "mojo/edk/system/make_unique.h"
 #include "mojo/edk/system/message_in_transit_queue.h"
 #include "mojo/edk/system/message_in_transit_test_utils.h"
 #include "mojo/edk/system/test_channel_endpoint_client.h"
@@ -184,7 +185,7 @@ class TestFilter : public EndpointRelayer::Filter {
 
 TEST_F(EndpointRelayerTest, Filter) {
   MessageInTransitQueue filtered_messages;
-  relayer()->SetFilter(make_scoped_ptr(new TestFilter(&filtered_messages)));
+  relayer()->SetFilter(MakeUnique<TestFilter>(&filtered_messages));
 
   EXPECT_TRUE(endpoint1a()->EnqueueMessage(test::MakeTestMessage(1)));
   EXPECT_TRUE(endpoint1a()->EnqueueMessage(test::MakeTestMessage(2)));