Untangle ViEChannel and ViEEncoder.

webrtc/modules/video_coding/video_coding_impl.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 292 matching lines @@
 }
 
 VideoCodingModule* VideoCodingModule::Create(Clock* clock,
                                              EventFactory* event_factory) {
   assert(clock);
   assert(event_factory);
   return new VideoCodingModuleImpl(clock, event_factory, false, nullptr,
                                    nullptr);
 }
 
-void VideoCodingModule::Destroy(VideoCodingModule* module) {
-  if (module != NULL) {
-    delete static_cast<VideoCodingModuleImpl*>(module);
-  }
-}
 }  // namespace webrtc