Move HostKeyPair into protocol::KeyPair.

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index c27d57a1cebe38afbbd698a9f49af2c8e6c55423..22a10d6a9bdd8aff8039f730a724a8a114701eb8 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',
@@ -2112,6 +2110,8 @@
         'base/rate_counter.h',
         'base/resources.cc',
         'base/resources.h',
+        'base/rsa_key_pair.cc',
+        'base/rsa_key_pair.h',
         'base/running_average.cc',
         'base/running_average.h',
         'base/socket_reader.cc',
@@ -2379,6 +2379,8 @@
         'base/breakpad_win_unittest.cc',
         'base/compound_buffer_unittest.cc',
         'base/resources_unittest.cc',
+        'base/rsa_key_pair_unittest.cc',
+        'base/test_rsa_key_pair.h',
         'base/typed_buffer_unittest.cc',
         'base/util_unittest.cc',
         'client/audio_player_unittest.cc',
@@ -2411,7 +2413,6 @@
         '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',
@@ -2431,7 +2432,6 @@
         'host/server_log_entry_unittest.cc',
         'host/setup/oauth_helper_unittest.cc',
         'host/setup/pin_validator_unittest.cc',
-        'host/test_key_pair.h',
         'host/video_scheduler_unittest.cc',
         'host/win/worker_process_launcher.cc',
         'host/win/worker_process_launcher.h',