bpf_dsl: replace scoped_refptr with std::shared_ptr

sandbox/linux/seccomp-bpf-helpers/baseline_policy.h

 // Copyright (c) 2013 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_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
 #define SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_
 
+#include <sys/types.h>
+
 #include "base/macros.h"
 #include "sandbox/linux/bpf_dsl/bpf_dsl_forward.h"
 #include "sandbox/linux/bpf_dsl/policy.h"
 #include "sandbox/sandbox_export.h"
 
 namespace sandbox {
 
 // This is a helper to build seccomp-bpf policies, i.e. policies for a sandbox
 // that reduces the Linux kernel's attack surface. Given its nature, it doesn't
 // have a clear semantics and is mostly "implementation-defined".
@@ skipping 22 matching lines @@
 
   // The PID that the policy applies to (should be equal to the current pid).
   pid_t policy_pid_;
 
   DISALLOW_COPY_AND_ASSIGN(BaselinePolicy);
 };
 
 }  // namespace sandbox.
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_HELPERS_BASELINE_POLICY_H_