Revert of [Mojo Video Capture] Adapt video_capture service to refactored video capture stack

media/capture/video/shared_memory_buffer_handle.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 MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_
-#define MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_
-
-#include "media/capture/capture_export.h"
-#include "media/capture/video/video_capture_buffer_handle.h"
-
-namespace media {
-
-// Provides access to memory-mapped shared memory without participating in the
-// lifetime management of the memory. Instances are typically handed out by
-// an instance of VideoCaptureDevice::Client as part of a
-// VideoCaptureDevice::Client::Buffer, which contains a separate
-// |access_permission| that guarantees that the memory stays alive. The buffers
-// are typically managed by an instance of VideoCaptureBufferPool.
-class CAPTURE_EXPORT SharedMemoryBufferHandle
-    : public VideoCaptureBufferHandle {
- public:
-  explicit SharedMemoryBufferHandle(base::SharedMemory* shared_memory,
-                                    size_t mapped_size);
-  ~SharedMemoryBufferHandle() override;
-
-  size_t mapped_size() const override;
-  uint8_t* data() const override;
-  const uint8_t* const_data() const override;
-
- private:
-  base::SharedMemory* const shared_memory_;
-  const size_t mapped_size_;
-};
-
-}  // namespace media
-
-#endif  // MEDIA_CAPTURE_VIDEO_SHARED_MEMORY_BUFFER_HANDLE_H_