Move HostKeyPair into protocol::KeyPair.

remoting/protocol/v2_authenticator_unittest.cc

Index: remoting/protocol/v2_authenticator_unittest.cc
diff --git a/remoting/protocol/v2_authenticator_unittest.cc b/remoting/protocol/v2_authenticator_unittest.cc
index da3512e0fc57ebc564790b74b84e82530571d017..9af517b645435e7f8ff97dbcf5decb1aa46689df 100644
--- a/remoting/protocol/v2_authenticator_unittest.cc
+++ b/remoting/protocol/v2_authenticator_unittest.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "net/base/net_errors.h"
+#include "remoting/base/rsa_key_pair.h"
 #include "remoting/protocol/authenticator_test_base.h"
 #include "remoting/protocol/channel_authenticator.h"
 #include "remoting/protocol/connection_tester.h"
@@ -41,7 +42,8 @@ class V2AuthenticatorTest : public AuthenticatorTestBase {
   void InitAuthenticators(const std::string& client_secret,
                           const std::string& host_secret) {
     host_ = V2Authenticator::CreateForHost(
-        host_cert_, *private_key_, host_secret, Authenticator::WAITING_MESSAGE);
+        host_cert_, key_pair_, host_secret,
+        Authenticator::WAITING_MESSAGE);
     client_ = V2Authenticator::CreateForClient(
         client_secret, Authenticator::MESSAGE_READY);
   }