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

remoting/proto/test.proto

Index: remoting/proto/test.proto
diff --git a/remoting/proto/test.proto b/remoting/proto/test.proto
deleted file mode 100644
index c02f408d6d4271f13f927c78611c3fe324a802e3..0000000000000000000000000000000000000000
--- a/remoting/proto/test.proto
+++ /dev/null
@@ -1,17 +0,0 @@
-// Copyright 2017 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.
-
-// Protocol for test only.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package remoting.protocol;
-
-// The proto for DataChannelManager test cases.
-// Next Id: 2
-message DataChannelManagerTestProto {
-  optional int32 data = 1;
-}