Revert of [Chromoting] Add DataChannelManager to manage optional incoming data channels

remoting/protocol/BUILD.gn

Index: remoting/protocol/BUILD.gn
diff --git a/remoting/protocol/BUILD.gn b/remoting/protocol/BUILD.gn
index 7ffbd451034e5418e25fe2cfda44fdbd6729c337..f9d4099c6b8bbad9111fa86557425222b9453928 100644
--- a/remoting/protocol/BUILD.gn
+++ b/remoting/protocol/BUILD.gn
@@ -49,8 +49,6 @@
     "content_description.cc",
     "content_description.h",
     "datagram_channel_factory.h",
-    "data_channel_manager.cc",
-    "data_channel_manager.h",
     "errors.cc",
     "errors.h",
     "frame_consumer.h",
@@ -106,8 +104,6 @@
     "monitored_video_stub.h",
     "mouse_input_filter.cc",
     "mouse_input_filter.h",
-    "named_message_pipe_handler.cc",
-    "named_message_pipe_handler.h",
     "negotiating_authenticator_base.cc",
     "negotiating_authenticator_base.h",
     "negotiating_client_authenticator.cc",
@@ -270,10 +266,6 @@
     "fake_connection_to_host.h",
     "fake_datagram_socket.cc",
     "fake_datagram_socket.h",
-    "fake_message_pipe.cc",
-    "fake_message_pipe.h",
-    "fake_message_pipe_wrapper.cc",
-    "fake_message_pipe_wrapper.h",
     "fake_session.cc",
     "fake_session.h",
     "fake_stream_socket.cc",
@@ -317,7 +309,6 @@
     "connection_tester.cc",
     "connection_tester.h",
     "content_description_unittest.cc",
-    "data_channel_manager_unittest.cc",
     "http_ice_config_request_unittest.cc",
     "ice_transport_unittest.cc",
     "input_event_tracker_unittest.cc",