Move HostKeyPair into protocol::KeyPair.

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index c27d57a1cebe38afbbd698a9f49af2c8e6c55423..fa4d821c4035ca1554cb272455b4e709bd0f727b 100644
--- a/remoting/remoting.gyp
+++ b/remoting/remoting.gyp
@@ -339,8 +339,6 @@
             'host/host_config.cc',
             'host/host_config.h',
             'host/host_exit_codes.h',
-            'host/host_key_pair.cc',
-            'host/host_key_pair.h',
             'host/host_port_allocator.cc',
             'host/host_port_allocator.h',
             'host/host_secret.cc',
@@ -2300,6 +2298,8 @@
         'protocol/jingle_session.h',
         'protocol/jingle_session_manager.cc',
         'protocol/jingle_session_manager.h',
+        'protocol/key_pair.cc',
+        'protocol/key_pair.h',
         'protocol/libjingle_transport_factory.cc',
         'protocol/libjingle_transport_factory.h',
         'protocol/me2me_host_authenticator_factory.cc',
@@ -2411,7 +2411,6 @@
         'host/desktop_session_agent_win.cc',
         'host/heartbeat_sender_unittest.cc',
         'host/host_change_notification_listener_unittest.cc',
-        'host/host_key_pair_unittest.cc',
         'host/host_mock_objects.cc',
         'host/host_mock_objects.h',
         'host/ipc_desktop_environment_unittest.cc',
@@ -2460,6 +2459,7 @@
         'protocol/input_filter_unittest.cc',
         'protocol/jingle_messages_unittest.cc',
         'protocol/jingle_session_unittest.cc',
+        'protocol/key_pair_unittest.cc',
         'protocol/message_decoder_unittest.cc',
         'protocol/message_reader_unittest.cc',
         'protocol/mouse_input_filter_unittest.cc',