Move sanbox_export.h to //sandbox from //sandbox/linux and split root OWNERS file.

sandbox/linux/seccomp-bpf/syscall.h

 // Copyright (c) 2012 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_SYSCALL_H__
 #define SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__
 
 #include <stdint.h>
 
-#include "sandbox/linux/sandbox_export.h"
+#include "sandbox/sandbox_export.h"
 
 namespace sandbox {
 
 // We have to make sure that we have a single "magic" return address for
 // our system calls, which we can check from within a BPF filter. This
 // works by writing a little bit of asm() code that a) enters the kernel, and
 // that also b) can be invoked in a way that computes this return address.
 // Passing "nr" as "-1" computes the "magic" return address. Passing any
 // other value invokes the appropriate system call.
 SANDBOX_EXPORT intptr_t SandboxSyscall(int nr,
@@ skipping 118 matching lines @@
     __attribute__((always_inline));
 SANDBOX_EXPORT inline intptr_t SandboxSyscall(int nr) {
   return SandboxSyscall(nr, 0, 0, 0, 0, 0, 0);
 }
 
 #endif  // Pre-C++11
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SECCOMP_BPF_SYSCALL_H__