Some build file cleanup

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",
 
   # We use mirrors of all github repos to guarantee reproducibility and
@@ skipping 58 matching lines @@
   "package_config_rev": "@0.1.3",
   "path_tag": "@1.3.6",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "plugin_tag": "@0.1.0",
   "pool_tag": "@1.2.1",
   "pub_rev": "@c1405b945c6d818c8cfe78334e8d4b11fd913103",
   "pub_cache_tag": "@v0.1.0",
   "pub_semver_tag": "@1.2.1",
   "quiver_tag": "@0.21.4",
   "resource_rev":"@a49101ba2deb29c728acba6fb86000a8f730f4b1",
-  "root_certificates_rev": "@c3a41df63afacec62fcb8135196177e35fe72f71",
+  "root_certificates_rev": "@218d6a723fab86a7b80aa5f9b591d5a51d2955eb",
   "scheduled_test_tag": "@0.12.5+2",
   "shelf_tag": "@0.6.5",
   "smoke_rev" : "@f3361191cc2a85ebc1e4d4c33aec672d7915aba9",
   "source_maps_tag": "@0.10.1",
   "shelf_static_tag": "@0.2.3+1",
   "shelf_web_socket_tag": "@0.2.0",
   "source_map_stack_trace_tag": "@1.0.4",
   "source_span_tag": "@1.2.0",
   "stack_trace_tag": "@1.4.2",
   "stream_channel_tag": "@1.3.1",
@@ skipping 351 matching lines @@
       "--extract",
       "-s",
       Var('dart_root') + "/third_party/clang.tar.gz.sha1",
     ],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/gyp_dart.py"],
   },
 ]