Convert //sandbox to use std::unique_ptr

sandbox/linux/suid/client/setuid_sandbox_host.h

 // Copyright 2015 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 SANDBOX_LINUX_SUID_SETUID_SANDBOX_HOST_H_
 #define SANDBOX_LINUX_SUID_SETUID_SANDBOX_HOST_H_
 
+#include <memory>
+
 #include "base/files/file_path.h"
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "base/process/launch.h"
 #include "sandbox/sandbox_export.h"
 
 namespace sandbox {
 
 // Helper class to use the setuid sandbox. This class is to be used
 // before launching the setuid helper.
 // This class is difficult to use. It has been created by refactoring very old
 // code scathered through the Chromium code base.
 //
@@ skipping 31 matching lines @@
                           base::FileHandleMappingVector* fds_to_remap,
                           base::ScopedFD* dummy_fd);
   // Set-up the environment. This should be done prior to launching the setuid
   // helper.
   void SetupLaunchEnvironment();
 
  private:
   explicit SetuidSandboxHost(base::Environment* env);
 
   // Holds the environment. Will never be NULL.
-  scoped_ptr<base::Environment> env_;
+  std::unique_ptr<base::Environment> env_;
 
   DISALLOW_COPY_AND_ASSIGN(SetuidSandboxHost);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SUID_SETUID_SANDBOX_HOST_H_