sandbox: add missing header files to the corresponding BUILD.gn file

sandbox/linux/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/nacl/config.gni")
 import("//sandbox/features.gni")
 import("//testing/test.gni")
 
 if (is_android) {
@@ skipping 373 matching lines @@
   }
 }
 
 source_set("sandbox_services_headers") {
   sources = [
     "system_headers/arm64_linux_syscalls.h",
     "system_headers/arm64_linux_ucontext.h",
     "system_headers/arm_linux_syscalls.h",
     "system_headers/arm_linux_ucontext.h",
     "system_headers/i386_linux_ucontext.h",
+    "system_headers/linux_filter.h",
     "system_headers/linux_futex.h",
     "system_headers/linux_seccomp.h",
     "system_headers/linux_signal.h",
     "system_headers/linux_syscalls.h",
     "system_headers/linux_time.h",
     "system_headers/linux_ucontext.h",
+    "system_headers/mips64_linux_syscalls.h",
+    "system_headers/mips_linux_syscalls.h",
+    "system_headers/mips_linux_ucontext.h",
     "system_headers/x86_32_linux_syscalls.h",
     "system_headers/x86_64_linux_syscalls.h",
+    "system_headers/x86_64_linux_ucontext.h",
   ]
 }
 
 if (compile_suid_client || is_nacl_nonsfi) {
   component("suid_sandbox_client") {
     sources = [
       "suid/client/setuid_sandbox_client.cc",
       "suid/client/setuid_sandbox_client.h",
       "suid/client/setuid_sandbox_host.cc",
       "suid/client/setuid_sandbox_host.h",
@@ skipping 20 matching lines @@
 
 if (is_android) {
   # TODO(GYP_GONE) Delete this after we've converted everything to GN.
   group("sandbox_linux_unittests_deps") {
     testonly = true
     deps = [
       ":sandbox_linux_unittests",
     ]
   }
 }