Update version of NSS in Dart to 3.16.7

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",
@@ skipping 27 matching lines @@
   "gson_rev" : "@36048",
   "gsutil_rev" : "@33376",
   "guava_rev" : "@19997",
   "hamcrest_rev" : "@19997",
   "idl_parser_rev": "@6316d5982dc24b34d09dd8b10fbeaaff28d83a48",
   "jinja2_rev": "@2222b31554f03e62600cd7e383376a7c187967a1",
   "json_rev" : "@19997",
   "junit_rev" : "@19997",
   "mockito_rev" : "@19997",
   "net_nss_rev": "@bf6305a7aa19bdcf8f590ceb5e16384f9af63745",
-  "nss_rev": "@7b5b6ec41cf9105bd6e1c9a5157982f821282a4c",
+  "nss_rev": "@87b96db4268293187d7cf741907a6d5d1d8080e0",
   "petitparser_rev" : "@37878",
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "snakeyaml_rev" : "@19997",
   "sqlite_rev": "@38811b79f42801662adc0458a25270ab690a6b81",
   "websocket_rev" : "@35854",
   "WebCore_rev" : "@40184",
   "weberknecht_rev" : "@33599",
   "zlib_rev": "@c3d0a6190f2f8c924a05ab6cc97b8f975bddd33f",
   "font_awesome_rev": "@31824",
   "barback-0.13.0_rev": "@34853",
@@ skipping 126 matching lines @@
   },
   {
     "pattern": ".",
     "action": ["python", "dart/editor/build/generate_sources.py"],
   },
   {
     "pattern": ".",
     "action": ["python", "dart/tools/gyp_dart.py"],
   },
 ]