convert //mash to std::unique_ptr

mash/screenlock/screenlock.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MASH_SCREENLOCK_SCREENLOCK_H_
 #define MASH_SCREENLOCK_SCREENLOCK_H_
 
 #include <map>
+#include <memory>
 
 #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/services/tracing/public/cpp/tracing_impl.h"
 #include "mojo/shell/public/cpp/shell_client.h"
 
 namespace views {
 class AuraInit;
 }
 
 namespace mash {
 namespace screenlock {
 
 class Screenlock : public mojo::ShellClient,
                    public session::mojom::ScreenlockStateListener {
  public:
   Screenlock();
   ~Screenlock() override;
 
  private:
   // mojo::ShellClient:
   void Initialize(mojo::Connector* connector,
                   const mojo::Identity& identity,
                   uint32_t id) override;
 
   // session::mojom::ScreenlockStateListener:
   void ScreenlockStateChanged(bool locked) override;
 
   mojo::TracingImpl tracing_;
-  scoped_ptr<views::AuraInit> aura_init_;
+  std::unique_ptr<views::AuraInit> aura_init_;
   mojo::BindingSet<session::mojom::ScreenlockStateListener> bindings_;
 
   DISALLOW_COPY_AND_ASSIGN(Screenlock);
 };
 
 }  // namespace screenlock
 }  // namespace mash
 
 #endif  // MASH_SCREENLOCK_SCREENLOCK_H_