Revert of Unify enum NextProto and enum AlternateProtocol.

net/socket/ssl_client_socket_impl.cc

Index: net/socket/ssl_client_socket_impl.cc
diff --git a/net/socket/ssl_client_socket_impl.cc b/net/socket/ssl_client_socket_impl.cc
index c032dff3a9eacc87e28764b05afe9c1b13365476..bb76bf8c46d6d84f7d5ad7d48eacfe751204d151 100644
--- a/net/socket/ssl_client_socket_impl.cc
+++ b/net/socket/ssl_client_socket_impl.cc
@@ -194,8 +194,8 @@
   dict->SetInteger("cipher_suite", SSLConnectionStatusToCipherSuite(
                                        ssl_info.connection_status));
 
-  dict->SetString("next_proto",
-                  NextProtoToString(socket->GetNegotiatedProtocol()));
+  dict->SetString("next_proto", SSLClientSocket::NextProtoToString(
+                                    socket->GetNegotiatedProtocol()));
 
   return std::move(dict);
 }