Convert //ash from scoped_ptr to std::unique_ptr

ash/mus/shell_delegate_mus.cc

 // 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.
 
 #include "ash/mus/shell_delegate_mus.h"
 
 #include "ash/default_accessibility_delegate.h"
 #include "ash/default_user_wallpaper_delegate.h"
 #include "ash/gpu_support_stub.h"
 #include "ash/media_delegate.h"
@@ skipping 52 matching lines @@
     return true;
   }
   void AddSessionStateObserver(ash::SessionStateObserver* observer) override {}
   void RemoveSessionStateObserver(
       ash::SessionStateObserver* observer) override {}
 
  private:
   bool screen_locked_;
 
   // A pseudo user info.
-  scoped_ptr<user_manager::UserInfo> user_info_;
+  std::unique_ptr<user_manager::UserInfo> user_info_;
 
   DISALLOW_COPY_AND_ASSIGN(SessionStateDelegateStub);
 };
 
 class MediaDelegateStub : public MediaDelegate {
  public:
   MediaDelegateStub() {}
   ~MediaDelegateStub() override {}
 
   // MediaDelegate:
@@ skipping 134 matching lines @@
   return base::string16();
 }
 
 gfx::Image ShellDelegateMus::GetDeprecatedAcceleratorImage() const {
   NOTIMPLEMENTED();
   return gfx::Image();
 }
 
 }  // namespace sysui
 }  // namespace ash