posix: upgrade libevent from 1.4.7 to 1.4.13

third_party/libevent/libevent.gyp

 # Copyright (c) 2009 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': [
     {
       'target_name': 'libevent',
       'product_name': 'event',
       'type': '<(library)',
@@ skipping 19 matching lines @@
         '.',   # libevent includes some of its own headers with #include <...>
                # instead of #include "..."
       ],
       'conditions': [
         # libevent has platform-specific implementation files.  Since its
         # native build uses autoconf, platform-specific config.h files are
         # provided and live in platform-specific directories.
         [ 'OS == "linux"', {
           'sources': [ 'epoll.c', 'epoll_sub.c' ],
           'include_dirs': [ 'linux' ],
-          'link_settings':
-            { 'libraries': [
+          'link_settings': {
+            'libraries': [
               # We need rt for clock_gettime().
               # TODO(port) Maybe on FreeBSD as well?
               '-lrt',
-              ],
-            },
-          }
-        ],
-        [ 'OS == "mac" or OS == "freebsd"',   { 'sources': [ 'kqueue.c' ],
-                             'include_dirs': [ 'mac' ] } ],
+            ],
+          },
+        }],
+        [ 'OS == "mac" or OS == "freebsd"', {
+          'sources': [ 'kqueue.c' ],
+          'include_dirs': [ 'mac' ]
+        }],
       ],
     },
   ],
 }
 
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