net: disable ChaCha20 based cipher suites.

net/socket/nss_ssl_util.cc

Index: net/socket/nss_ssl_util.cc
diff --git a/net/socket/nss_ssl_util.cc b/net/socket/nss_ssl_util.cc
index 7e3aee430c4417353bca38270ea2f4564e90a0e0..8547d4dc1cf493f167c4a2ebb731c809029870dc 100644
--- a/net/socket/nss_ssl_util.cc
+++ b/net/socket/nss_ssl_util.cc
@@ -70,6 +70,11 @@ class NSSSSLInitSingleton {
           enabled = false;
         }
 
+        // We also disable ChaCha20 based cipher suites for now because we
+        // aren't quite ready to use them in M32.
+        if (info.symCipher == ssl_calg_chacha20)
+          enabled = false;
+
         if (ssl_ciphers[i] == TLS_DHE_DSS_WITH_AES_128_CBC_SHA) {
           // Enabled to allow servers with only a DSA certificate to function.
           enabled = true;