Roll src/third_party/boringssl/src 771a138:a07c0fc

Summary of changes available at:
https://boringssl.googlesource.com/boringssl/+log/771a138..a07c0fc

This pulls in the SSL_get_current_cipher fix.

BUG=none

Review URL: https://codereview.chromium.org/1126233010

Cr-Commit-Position: refs/heads/master@{#330174}

DEPS

@@ -74,7 +74,7 @@ vars = {
   # 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': '771a138f2612c581a547cb3f045b3f6753fe5571',
+  'boringssl_revision': 'a07c0fc8f2181d086b1118712e2ceb0d1496fa0b',
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling nss
   # and whatever else without interference from each other.

third_party/boringssl/boringssl_tests.gypi

@@ -83,7 +83,7 @@
         'boringssl.gyp:boringssl',
       ],
       'sources': [
-        'src/crypto/cipher/cipher_test.c',
+        'src/crypto/cipher/cipher_test.cc',
         '<@(boringssl_test_support_sources)',
       ],
       # TODO(davidben): Fix size_t truncations in BoringSSL.