Roll firefox jsshell deps to version 28

deps/all.deps/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 = {
   # Use this googlecode_url variable only if there is an internal mirror for it.
   # If you do not know, use the full path while defining your new deps entry.
   "googlecode_url": "http://%s.googlecode.com/svn",
 
   "gyp_rev": "@1752",
   "nss_rev": "@257452",
   "co19_rev": "@722",
   "chromium_url": "http://src.chromium.org/svn",
   "chromium_git": "http://git.chromium.org/git",
 
   # Revisions of /third_party/* dependencies.
   "7zip_rev" : "@19997",
   "apache_ant_rev" : "@19997",
   "apache_compress_rev" : "@19997",
   "args4j_rev" : "@19997",
   "bzip2_rev" : "@19997",
   "chrome_rev" : "@19997",
   "clang_rev" : "@28450",
   "commons-io_rev" : "@19997",
   "commons-lang_rev" : "@33092",
   "d8_rev" : "@34959",
   "eclipse_rev" : "@31921",
   "fest_rev" : "@19997",
-  "firefox_jsshell_rev" : "@32115",
+  "firefox_jsshell_rev" : "@35614",
   "gsutil_rev" : "@33376",
   "guava_rev" : "@19997",
   "hamcrest_rev" : "@19997",
   "json_rev" : "@19997",
   "junit_rev" : "@19997",
   "mockito_rev" : "@19997",
   "snakeyaml_rev" : "@19997",
   "stripjar_rev" : "@20110",
   "WebCore_rev" : "@34173",
   "weberknecht_rev" : "@33599",
@@ skipping 88 matching lines @@
   },
   {
     "pattern": ".",
     "action": ["python", "dart/editor/build/generate_sources.py"],
   },
   {
     "pattern": ".",
     "action": ["python", "dart/tools/gyp_dart.py"],
   },
 ]