Make protocol::ConnectionToClient an abstract interface.

remoting/remoting_srcs.gypi

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'daemon_controller_guid': '655bd819-c08c-4b04-80c2-f160739ff6ef',
     'rdp_desktop_session_guid': '6a7699f0-ee43-43e7-aa30-a6738f9bd470',
     'remoting_base_sources': [
       'base/auto_thread.cc',
@@ skipping 88 matching lines @@
       'protocol/client_stub.h',
       'protocol/client_video_dispatcher.cc',
       'protocol/client_video_dispatcher.h',
       'protocol/clipboard_echo_filter.cc',
       'protocol/clipboard_echo_filter.h',
       'protocol/clipboard_filter.cc',
       'protocol/clipboard_filter.h',
       'protocol/clipboard_stub.h',
       'protocol/clipboard_thread_proxy.cc',
       'protocol/clipboard_thread_proxy.h',
-      'protocol/connection_to_client.cc',
       'protocol/connection_to_client.h',
       'protocol/connection_to_host.h',
       'protocol/connection_to_host_impl.cc',
       'protocol/connection_to_host_impl.h',
       'protocol/content_description.cc',
       'protocol/content_description.h',
       'protocol/datagram_channel_factory.h',
       'protocol/errors.cc',
       'protocol/errors.h',
       'protocol/host_control_dispatcher.cc',
       'protocol/host_control_dispatcher.h',
       'protocol/host_event_dispatcher.cc',
       'protocol/host_event_dispatcher.h',
       'protocol/host_stub.h',
       'protocol/host_video_dispatcher.cc',
       'protocol/host_video_dispatcher.h',
+      'protocol/ice_connection_to_client.cc',
+      'protocol/ice_connection_to_client.h',
       'protocol/ice_transport_channel.cc',
       'protocol/ice_transport_channel.h',
       'protocol/ice_transport_factory.cc',
       'protocol/ice_transport_factory.h',
       'protocol/ice_transport.cc',
       'protocol/ice_transport.h',
       'protocol/input_event_tracker.cc',
       'protocol/input_event_tracker.h',
       'protocol/input_filter.cc',
       'protocol/input_filter.h',
@@ skipping 156 matching lines @@
       'client/plugin/pepper_util.cc',
       'client/plugin/pepper_util.h',
       'client/plugin/pepper_video_renderer.h',
       'client/plugin/pepper_video_renderer_2d.cc',
       'client/plugin/pepper_video_renderer_2d.h',
       'client/plugin/pepper_video_renderer_3d.cc',
       'client/plugin/pepper_video_renderer_3d.h',
     ],
   }
 }