Remove spake2_plain authentication method.

remoting/protocol/me2me_host_authenticator_factory.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "remoting/protocol/me2me_host_authenticator_factory.h"
 
 #include <utility>
 
 #include "base/base64.h"
 #include "base/strings/string_util.h"
@@ skipping 107 matching lines @@
   if (!local_cert_.empty() && key_pair_.get()) {
     std::string normalized_local_jid = NormalizeJid(local_jid);
     std::string normalized_remote_jid = NormalizeJid(remote_jid);
 
     if (token_validator_factory_) {
       return NegotiatingHostAuthenticator::CreateWithThirdPartyAuth(
           normalized_local_jid, normalized_remote_jid, local_cert_, key_pair_,
           token_validator_factory_);
     }
 
-    return NegotiatingHostAuthenticator::CreateWithPin(
+    return NegotiatingHostAuthenticator::CreateWithSharedSecret(
         normalized_local_jid, normalized_remote_jid, local_cert_, key_pair_,
         pin_hash_, pairing_registry_);
   }
 
   return make_scoped_ptr(
       new RejectingAuthenticator(Authenticator::INVALID_CREDENTIALS));
 }
 
 }  // namespace protocol
 }  // namespace remoting