Reland dd7edfa67: Switch Mac over to BoringSSL from NSS.

DEPS

 # This file is automatically processed to create .DEPS.git which is the file
 # that gclient uses under git.
 #
 # See http://code.google.com/p/chromium/wiki/UsingGit
 #
 # To test manually, run:
 #   python tools/deps2git/deps2git.py -o .DEPS.git -w <gclientdir>
 # where <gcliendir> is the absolute path to the directory containing the
 # .gclient file (the parent of 'src').
 #
@@ skipping 49 matching lines @@
   # the commit queue can handle CLs rolling PDFIum
   # and whatever else without interference from each other.
   'pdfium_revision': '12a9940905825e028bebc0bf8d3eddcc65b1933d',
   # 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': '79e64bc9243e5ff11822434cf39b9fabefff3bfb',
   # 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': '1195796045e1f8bbd1ed311b2cbd8b9d87f2074a',
+  'boringssl_revision': 'a70c75cfc0ca32a43985e3f24d737ca9cafcb910',
   # 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': '7b5b6ec41cf9105bd6e1c9a5157982f821282a4c',
   # 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
@@ skipping 719 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',
     ],
   },
 ]