Enable Curve25519 in host and client for PIN-based and third-party auth.

remoting/protocol/spake2_authenticator.h

Index: remoting/protocol/spake2_authenticator.h
diff --git a/remoting/protocol/spake2_authenticator.h b/remoting/protocol/spake2_authenticator.h
index b16d634d6caf7ff47b6fabf5d5eda84fda6ede4a..15456e0d8db9de53bf53b6bc31730846eb51d172 100644
--- a/remoting/protocol/spake2_authenticator.h
+++ b/remoting/protocol/spake2_authenticator.h
@@ -35,9 +35,9 @@ class Spake2Authenticator : public Authenticator {
   static scoped_ptr<Authenticator> CreateForHost(
       const std::string& local_id,
       const std::string& remote_id,
-      const std::string& shared_secret,
       const std::string& local_cert,
       scoped_refptr<RsaKeyPair> key_pair,
+      const std::string& shared_secret,
       State initial_state);
 
   ~Spake2Authenticator() override;