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

services/media/framework/allocator.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_ALLOCATOR_H_
-#define SERVICES_MEDIA_FRAMEWORK_ALLOCATOR_H_
-
-#include <cstdint>
-
-namespace mojo {
-namespace media {
-
-// Abstract base class for objects that allocate buffers for packets.
-class Allocator {
- public:
-  // Gets the default allocator, which allocates vanilla memory from the heap.
-  static Allocator* GetDefault();
-
-  // Allocates and returns a buffer of the indicated size or returns nullptr
-  // if the allocation fails.
-  // TODO(dalesat): Use size_t for sizes in units of bytes framework-wide.
-  virtual void* AllocatePayloadBuffer(uint64_t size) = 0;
-
-  // Releases a buffer previously allocated via AllocatePayloadBuffer.
-  virtual void ReleasePayloadBuffer(uint64_t size, void* buffer) = 0;
-};
-
-}  // namespace media
-}  // namespace mojo
-
-#endif // SERVICES_MEDIA_FRAMEWORK_ALLOCATOR_H_