Move HostKeyPair into protocol::KeyPair.

remoting/protocol/negotiating_authenticator_unittest.cc

Index: remoting/protocol/negotiating_authenticator_unittest.cc
diff --git a/remoting/protocol/negotiating_authenticator_unittest.cc b/remoting/protocol/negotiating_authenticator_unittest.cc
index e62a8e375534ea292685a9aee61c9399b03b6498..213502247d32e46527664e61a4853a8fb174b4f2 100644
--- a/remoting/protocol/negotiating_authenticator_unittest.cc
+++ b/remoting/protocol/negotiating_authenticator_unittest.cc
@@ -9,6 +9,7 @@
 #include "remoting/protocol/authenticator_test_base.h"
 #include "remoting/protocol/channel_authenticator.h"
 #include "remoting/protocol/connection_tester.h"
+#include "remoting/protocol/key_pair.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/libjingle/source/talk/xmllite/xmlelement.h"
@@ -48,7 +49,7 @@ class NegotiatingAuthenticatorTest : public AuthenticatorTestBase {
     std::string host_secret_hash = AuthenticationMethod::ApplyHashFunction(
         hash_function, kTestHostId, host_secret);
     host_ = NegotiatingAuthenticator::CreateForHost(
-        host_cert_, *private_key_, host_secret_hash, hash_function);
+        host_cert_, key_pair_->Copy(), host_secret_hash, hash_function);
 
     std::vector<AuthenticationMethod> methods;
     methods.push_back(AuthenticationMethod::Spake2(