Update pub to use the latest package_config.

DEPS

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 vars = {
   # The dart_root is the root of our sdk checkout. This is normally
   # simply sdk, but if using special gclient specs it can be different.
   "dart_root": "sdk",
 
   # The svn location to pull out dependencies from
@@ skipping 65 matching lines @@
   "nss_rev": "@87b96db4268293187d7cf741907a6d5d1d8080e0",
   "oauth2_rev": "@1bff41f4d54505c36f2d1a001b83b8b745c452f5",
   "observe_rev": "@eee2b8ec34236fa46982575fbccff84f61202ac6",
   "observatory_pub_packages_rev": "@45565",
   "package_config_tag": "@0.1.1",
   "path_rev": "@93b3e2aa1db0ac0c8bab9d341588d77acda60320",
   "petitparser_rev" : "@37878",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "plugin_tag": "@0.1.0",
   "pool_rev": "@22e12aeb16ad0b626900dbe79e4a25391ddfb28c",
-  "pub_rev": "@0c02113cc761ec5f142a8c41ff277505fafa5e10",
+  "pub_rev": "@8884f572979f35a7918549caa5f258b89715aff1",
   "pub_cache_tag": "@v0.0.1+2",
   "pub_semver_tag": "@1.2.1",
   "quiver_tag": "@0.21.4",
   "scheduled_test_tag": "@0.11.8+1",
   "shelf_rev": "@1e87b79b21ac5e6fa2f93576d6c06eaa65285ef4",
   "smoke_rev" : "@f3361191cc2a85ebc1e4d4c33aec672d7915aba9",
   "source_maps_rev": "@379b4f31c4e2987eb15934d1ad8b419c6cc897b3",
   "sqlite_rev": "@38811b79f42801662adc0458a25270ab690a6b81",
   "shelf_static_rev": "@v0.2.1",
   "shelf_web_socket_rev": "@ff170cec2c0e4e5722cdf47c557be63b5035a602",
@@ skipping 270 matching lines @@
       '--no_resume',
       '--bucket',
       'dart-dependencies',
       '-d',
       '-r',
       Var('dart_root') + '/third_party/d8',
     ],
   },
 
 ]