convert //mash to std::unique_ptr

mash/session/session.h

Index: mash/session/session.h
diff --git a/mash/session/session.h b/mash/session/session.h
index a2a133b4063e825921af75f89d18d0c313c668e2..992b7c064462dcc0eb4f8b6a6c1498060dae5234 100644
--- a/mash/session/session.h
+++ b/mash/session/session.h
@@ -6,10 +6,10 @@
 #define MASH_SESSION_SESSION_H_
 
 #include <map>
+#include <memory>
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "mash/session/public/interfaces/session.mojom.h"
 #include "mojo/public/cpp/bindings/binding_set.h"
 #include "mojo/public/cpp/bindings/interface_ptr_set.h"
@@ -63,7 +63,7 @@ class Session : public mojo::ShellClient,
                                const base::Closure& restart_callback);
 
   mojo::Connector* connector_;
-  std::map<std::string, scoped_ptr<mojo::Connection>> connections_;
+  std::map<std::string, std::unique_ptr<mojo::Connection>> connections_;
   bool screen_locked_;
   mojo::BindingSet<mojom::Session> bindings_;
   mojo::InterfacePtrSet<mojom::ScreenlockStateListener> screenlock_listeners_;