Refactored ErrorCode into it's own class

sandbox/linux/sandbox_linux.gypi

 # 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.
 
 {
   'targets': [
     # We have two principal targets: sandbox and sandbox_linux_unittests
     # All other targets are listed as dependencies.
     # FIXME(jln): for historial reasons, sandbox_linux is the setuid sandbox
     # and is its own target.
@@ skipping 40 matching lines @@
           'sources': [
             'seccomp-bpf/sandbox_bpf_unittest.cc',
           ],
         }],
       ],
     },
     {
       'target_name': 'seccomp_bpf',
       'type': 'static_library',
       'sources': [
+        'seccomp-bpf/errorcode.cc',
+        'seccomp-bpf/errorcode.h',
         'seccomp-bpf/sandbox_bpf.cc',
         'seccomp-bpf/sandbox_bpf.h',
         'seccomp-bpf/verifier.cc',
         'seccomp-bpf/verifier.h',
       ],
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'include_dirs': [
         '../..',
@@ skipping 46 matching lines @@
       'dependencies': [
         '../base/base.gyp:base',
       ],
       'include_dirs': [
         '..',
       ],
     },
 
   ],
 }