Add support for MD2, MD4, and MD5 to SignatureAlgorithm.

net/cert/x509_util_openssl.cc

Index: net/cert/x509_util_openssl.cc
diff --git a/net/cert/x509_util_openssl.cc b/net/cert/x509_util_openssl.cc
index 4a58262dab682e5f0abd64085c3986bc5de0c39a..72f93f269835f4c42b58016f102144c4cd025438 100644
--- a/net/cert/x509_util_openssl.cc
+++ b/net/cert/x509_util_openssl.cc
@@ -339,6 +339,14 @@ bool GetTLSServerEndPointChannelBinding(const X509Certificate& certificate,
 
   const EVP_MD* digest_evp_md = nullptr;
   switch (signature_algorithm->digest()) {
+    case net::DigestAlgorithm::Md2:
+    case net::DigestAlgorithm::Md4:
+      // Shouldn't be reachable.
+      digest_evp_md = nullptr;
+      break;
+
+    // Per RFC 5929 section 4.1, MD5 and SHA1 map to SHA256.
+    case net::DigestAlgorithm::Md5:
     case net::DigestAlgorithm::Sha1:
     case net::DigestAlgorithm::Sha256:
       digest_evp_md = EVP_sha256();