Roll third_party/nss to NSS 3.18

DEPS

 # This file is used to manage the dependencies of the Chromium src repo. It is
 # used by gclient to determine what version of each dependency to check out, and
 # where.
 #
 # For more information, please refer to the official documentation:
 #   https://sites.google.com/a/chromium.org/dev/developers/how-tos/get-the-code
 #
 # When adding a new dependency, please update the top-level .gitignore file
 # to list the dependency's destination directory.
 #
@@ skipping 60 matching lines @@
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
   'openmax_dl_revision': '0b238cb62c32b6f45680cf577eddb1b051ae0219',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling BoringSSL
   # and whatever else without interference from each other.
   'boringssl_revision': '40acdaeb86c516b68e3442f3a008e8d21e514bda',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nss
   # and whatever else without interference from each other.
-  'nss_revision': 'bb4e75a43d007518ae7d618665ea2f25b0c60b63',
+  'nss_revision': 'd1edb68688b91a380fb2025b3420fad68db54ed6', # from svn revision 294684
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling google-toolbox-for-mac
   # and whatever else without interference from each other.
   'google_toolbox_for_mac_revision': '17eee6933bb4a978bf045ef1b12fc68f15b08cd2', # from svn revision 703
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lighttpd
   # and whatever else without interference from each other.
   'lighttpd_revision': '9dfa55d15937a688a92cbf2b7a8621b0927d06eb',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lss
@@ skipping 697 matching lines @@
     # corresponding .py files have already been deleted.
     'name': 'remove_stale_pyc_files',
     'pattern': 'src/tools/.*\\.py',
     'action': [
         'python',
         'src/tools/remove_stale_pyc_files.py',
         'src/tools',
     ],
   },
 ]