Update from https://crrev.com/304121

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.
 
 {
   'variables': {
     'conditions': [
       ['OS=="linux"', {
         'compile_suid_client': 1,
         'compile_credentials': 1,
@@ skipping 210 matching lines @@
       'type': '<(component)',
       'sources': [
         'services/init_process_reaper.cc',
         'services/init_process_reaper.h',
         'services/scoped_process.cc',
         'services/scoped_process.h',
         'services/thread_helpers.cc',
         'services/thread_helpers.h',
         'services/yama.cc',
         'services/yama.h',
+        'syscall_broker/broker_channel.cc',
+        'syscall_broker/broker_channel.h',
         'syscall_broker/broker_client.cc',
         'syscall_broker/broker_client.h',
         'syscall_broker/broker_common.h',
         'syscall_broker/broker_host.cc',
         'syscall_broker/broker_host.h',
         'syscall_broker/broker_policy.cc',
         'syscall_broker/broker_policy.h',
         'syscall_broker/broker_process.cc',
         'syscall_broker/broker_process.h',
       ],
@@ skipping 136 matching lines @@
             '../../build/isolate.gypi',
           ],
           'sources': [
             '../sandbox_linux_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }