Motown: Remove LPCM optimizations, fix prepare, add flush, add ActiveMultistreamSink model/stage

services/media/framework_create/demux.cc

 // Copyright 2016 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.
 
 #include "services/media/framework/parts/demux.h"
 
 namespace mojo {
 namespace media {
 
-Result Demux::Create(ReaderPtr reader, DemuxPtr* demux_out) {
+Result Demux::Create(
+    std::shared_ptr<Reader> reader,
+    std::shared_ptr<Demux>* demux_out) {
   return Result::kUnsupportedOperation;
 }
 
 } // namespace media
 } // namespace mojo