external/boringssl: Sync to 689019fe40d5ad94df46ffeebcd794ff359a7074.

This includes the following changes:

https://boringssl.googlesource.com/boringssl/+log/67e64342c1aa0b31b0b5c11e5ee21c481ce530e8..689019fe40d5ad94df46ffeebcd794ff359a7074

Test: BoringSSL CTS Presubmits
Change-Id: Ib675c5478b0e45270e31248d1dadc5f4841da990
diff --git a/src/include/openssl/pkcs7.h b/src/include/openssl/pkcs7.h
index 52b649c..cb6155f 100644
--- a/src/include/openssl/pkcs7.h
+++ b/src/include/openssl/pkcs7.h
@@ -199,11 +199,11 @@
 }  // extern C
 
 extern "C++" {
-namespace bssl {
+BSSL_NAMESPACE_BEGIN
 
 BORINGSSL_MAKE_DELETER(PKCS7, PKCS7_free)
 
-}  // namespace bssl
+BSSL_NAMESPACE_END
 }  // extern C++
 #endif