Move HostKeyPair into protocol::KeyPair.

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index d0009f6b8c20df80f1240d85b1e6c819a0bf949b..e1bad8fac5744f38135f9f8de043a07869093dc4 100644
--- a/remoting/remoting.gyp
+++ b/remoting/remoting.gyp
@@ -360,8 +360,6 @@
             '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',
@@ -2226,6 +2224,8 @@
         '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',
@@ -2492,6 +2492,8 @@
         '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',
@@ -2524,7 +2526,6 @@
         '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/host_status_monitor_fake.h',
@@ -2545,7 +2546,6 @@
         '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/rdp_client_unittest.cc',
         'host/win/worker_process_launcher.cc',