Convert //sandbox to use std::unique_ptr

sandbox/linux/seccomp-bpf/sandbox_bpf.h

Index: sandbox/linux/seccomp-bpf/sandbox_bpf.h
diff --git a/sandbox/linux/seccomp-bpf/sandbox_bpf.h b/sandbox/linux/seccomp-bpf/sandbox_bpf.h
index e758e03121408aba0523c1f501efcc5540a08466..1637b26ea5f59b681ec24a35a5a744927dadd439 100644
--- a/sandbox/linux/seccomp-bpf/sandbox_bpf.h
+++ b/sandbox/linux/seccomp-bpf/sandbox_bpf.h
@@ -7,9 +7,10 @@
 
 #include <stdint.h>
 
+#include <memory>
+
 #include "base/files/scoped_file.h"
 #include "base/macros.h"
-#include "base/memory/scoped_ptr.h"
 #include "sandbox/linux/bpf_dsl/codegen.h"
 #include "sandbox/sandbox_export.h"
 
@@ -104,7 +105,7 @@ class SANDBOX_EXPORT SandboxBPF {
 
   base::ScopedFD proc_fd_;
   bool sandbox_has_started_;
-  scoped_ptr<bpf_dsl::Policy> policy_;
+  std::unique_ptr<bpf_dsl::Policy> policy_;
 
   DISALLOW_COPY_AND_ASSIGN(SandboxBPF);
 };