Roll usrsctplib from 8875 to 8912.

third_party/usrsctp/usrsctp.gyp

 # 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': {
     'libsctp_target_type%': 'static_library',
   },
   'target_defaults': {
     'defines': [
       'SCTP_PROCESS_LEVEL_LOCKS',
@@ skipping 109 matching lines @@
         'usrsctplib/usrsctp.h'
       ],  # sources
       'conditions': [
         ['OS=="linux" or OS=="android"', {
           'defines': [
             '__Userspace_os_Linux',
           ],
           'cflags!': [ '-Werror', '-Wall' ],
           'cflags': [ '-w' ],
         }],
-        ['OS=="mac"', {
+        ['OS=="mac" or OS=="ios"', {
           'defines': [
             'HAVE_SA_LEN',
             'HAVE_SCONN_LEN',
             '__APPLE_USE_RFC_2292',
             '__Userspace_os_Darwin',
           ],
           # usrsctp requires that __APPLE__ is undefined for compilation (for
           # historical reasons). There is a plan to change this, and when it
           # happens and we re-roll DEPS for usrsctp, we can remove the manual
           # undefining of __APPLE__.
@@ skipping 23 matching lines @@
           'msvs_disabled_warnings': [ 4002, 4013, 4018, 4133, 4267, 4313, 4700 ],
         }, {  # OS != "win",
           'defines': [
             'NON_WINDOWS_DEFINE',
           ],
         }],
       ],  # conditions
     },  # target usrsctp
   ],  # targets
 }