roll to newest web_components

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 79 matching lines @@
   "string_scanner_tag": "@0.1.4",
   "sunflower_rev": "@879b704933413414679396b129f5dfa96f7a0b1e",
   "test_tag": "@0.12.12",
   "test_reflective_loader_tag": "@0.0.3",
   "typed_data_tag": "@1.1.2",
   "utf_rev": "@1f55027068759e2d52f2c12de6a57cce5f3c5ee6",
   "usage_rev": "@b5080dac0d26a5609b266f8fdb0d053bc4c1c638",
   "watcher_tag": "@0.9.7",
   "when_tag": "@0.2.0+2",
   "which_tag": "@0.1.3+1",
-  "web_components_rev": "@0e636b534d9b12c9e96f841e6679398e91a986ec",
+  "web_components_rev": "@6349e09f9118dce7ae1b309af5763745e25a9d61",
   "web_socket_channel_tag": "@1.0.0",
   "WebCore_rev": "@a86fe28efadcfc781f836037a80f27e22a5dad17",
   "yaml_tag": "@2.1.5",
   "zlib_rev": "@c3d0a6190f2f8c924a05ab6cc97b8f975bddd33f",
   "barback-0.13.0_rev": "@34853",
   "barback-0.14.0_rev": "@36398",
   "barback-0.14.1_rev": "@38525",
   "source_maps-0.9.4_rev": "@38524",
 }
 
@@ skipping 330 matching lines @@
       "--extract",
       "-s",
       Var('dart_root') + "/third_party/clang.tar.gz.sha1",
     ],
   },
   {
     "pattern": ".",
     "action": ["python", Var("dart_root") + "/tools/gyp_dart.py"],
   },
 ]