clang: Suppress a -Wstring-conversion warnings in nspr.

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 62 matching lines @@
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
   'openmax_dl_revision': '01642706d2b37cb7b9db84add870ea0fdabdf5ad',
   # 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': '69a01608f33ab6fe2c3485d94aef1fe9eacf5364',
   # 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': '258342ecf9c65105189092ef6339dc4e7779a7ae',
+  'nss_revision': '6814ecc6c409fe201a8eb2af816f037b4c5d4478',
   # 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': 'a09526298f9dd1ec49d3b3ac5608d2a257b94cef',
   # 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 688 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',
     ],
   },
 ]