EDK: Add a MakeUnique and use it somewhere.

mojo/edk/system/endpoint_relayer.cc

Index: mojo/edk/system/endpoint_relayer.cc
diff --git a/mojo/edk/system/endpoint_relayer.cc b/mojo/edk/system/endpoint_relayer.cc
index 9655f9cfb9f769de2499e9d2a82fc5f3ffa5b7e9..901765151dccf462f3ceed182888ce0ead5fe395 100644
--- a/mojo/edk/system/endpoint_relayer.cc
+++ b/mojo/edk/system/endpoint_relayer.cc
@@ -4,6 +4,8 @@
 
 #include "mojo/edk/system/endpoint_relayer.h"
 
+#include <utility>
+
 #include "base/logging.h"
 #include "mojo/edk/system/channel_endpoint.h"
 #include "mojo/edk/system/message_in_transit.h"
@@ -30,9 +32,9 @@ void EndpointRelayer::Init(ChannelEndpoint* endpoint0,
   endpoints_[1] = endpoint1;
 }
 
-void EndpointRelayer::SetFilter(scoped_ptr<Filter> filter) {
+void EndpointRelayer::SetFilter(std::unique_ptr<Filter> filter) {
   MutexLocker locker(&mutex_);
-  filter_ = filter.Pass();
+  filter_ = std::move(filter);
 }
 
 bool EndpointRelayer::OnReadMessage(unsigned port, MessageInTransit* message) {