Refactored ErrorCode into it's own class

sandbox/linux/seccomp-bpf/util.cc

Index: sandbox/linux/seccomp-bpf/util.cc
diff --git a/sandbox/linux/seccomp-bpf/util.cc b/sandbox/linux/seccomp-bpf/util.cc
index ac751460b9cecc7a7c58b35b79bdce66f4c0c44e..904a1691407241210afca094550f7d254e4b5e48 100644
--- a/sandbox/linux/seccomp-bpf/util.cc
+++ b/sandbox/linux/seccomp-bpf/util.cc
@@ -118,7 +118,7 @@ bool Util::getFds(int transport, void *buf, size_t *len, ...) {
 void Util::closeAllBut(int fd, ...) {
   int proc_fd;
   int fdir;
-  if ((proc_fd = Sandbox::getProcFd()) < 0 ||
+  if ((proc_fd = Sandbox::proc_fd()) < 0 ||
       (fdir = openat(proc_fd, "self/fd", O_RDONLY|O_DIRECTORY)) < 0) {
     SANDBOX_DIE("Cannot access \"/proc/self/fd\"");
   }