Update from https://crrev.com/302630

sandbox/linux/syscall_broker/broker_host.h

+// Copyright 2014 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_SYSCALL_BROKER_BROKER_HOST_H_
+#define SANDBOX_LINUX_SYSCALL_BROKER_BROKER_HOST_H_
+
+#include "base/macros.h"
+
+namespace sandbox {
+
+namespace syscall_broker {
+
+class BrokerPolicy;
+
+// The BrokerHost class should be embedded in a (presumably not sandboxed)
+// process. It will honor IPC requests from a BrokerClient sent over
+// |ipc_channel| according to |broker_policy|.
+class BrokerHost {
+ public:
+  BrokerHost(const BrokerPolicy& broker_policy, int ipc_channel);
+  ~BrokerHost();
+
+  bool HandleRequest() const;
+
+ private:
+  const BrokerPolicy& broker_policy_;
+  const int ipc_channel_;
+  DISALLOW_COPY_AND_ASSIGN(BrokerHost);
+};
+
+}  // namespace syscall_broker
+
+}  // namespace sandbox
+
+#endif  //  SANDBOX_LINUX_SYSCALL_BROKER_BROKER_HOST_H_