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

services/media/framework/parts/lpcm_reformatter.h

 // 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.
 
 #ifndef SERVICES_MEDIA_FRAMEWORK_PARTS_LPCM_REFORMATTER_H_
 #define SERVICES_MEDIA_FRAMEWORK_PARTS_LPCM_REFORMATTER_H_
 
-#include "services/media/framework/models/lpcm_transform.h"
+#include "services/media/framework/models/transform.h"
 #include "services/media/framework/stream_type.h"
 
 namespace mojo {
 namespace media {
 
-class LpcmReformatter;
-
-typedef SharedPtr<LpcmReformatter, LpcmTransform> LpcmReformatterPtr;
-
 // A transform that reformats samples.
-// TODO(dalesat): Some variations on this could be InPlacePacketTransforms.
-class LpcmReformatter : public LpcmTransform {
+// TODO(dalesat): Some variations on this could be InPlaceTransforms.
+class LpcmReformatter : public Transform {
  public:
-  static LpcmReformatterPtr Create(
+  static std::shared_ptr<LpcmReformatter> Create(
       const LpcmStreamType& in_type,
       const LpcmStreamTypeSet& out_type);
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif // SERVICES_MEDIA_FRAMEWORK_PARTS_LPCM_REFORMATTER_H_