Build BoringSSL without assembly if using MSan.

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 56 matching lines @@
   # the commit queue can handle CLs rolling PDFium
   # and whatever else without interference from each other.
   'pdfium_revision': 'f33cdd54d5d5340d8a662048d9cf4abe7d5f0488',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling openmax_dl
   # and whatever else without interference from each other.
   'openmax_dl_revision': '22bb1085a6a0f6f3589a8c3d60ed0a9b82248275',
   # 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': 'a07c0fc8f2181d086b1118712e2ceb0d1496fa0b',
+  'boringssl_revision': '966003273dc1a8b92f376aefa81232f14eecde8a',
   # 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': '95068068df410e398ac221a9195c999b22bd63e9', # from svn revision 294785
   # 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': 'ce47a231ea0b238fbe95538e86cc61d74c234be6', # from svn revision 705
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling lighttpd
@@ skipping 669 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',
     ],
   },
 ]