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

media/capture/video/video_capture_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_VIDEO_CAPTURE_BUFFER_HANDLE_H_
 #define MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_BUFFER_HANDLE_H_
 
 #include "base/files/file.h"
 #include "media/base/video_frame.h"
 #include "media/capture/capture_export.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/gpu_memory_buffer.h"
 
 namespace media {
 
 // Abstraction of a pool's buffer data buffer and size for clients.
 class CAPTURE_EXPORT VideoCaptureBufferHandle {
  public:
   virtual ~VideoCaptureBufferHandle() {}
   virtual size_t mapped_size() const = 0;
-  virtual uint8_t* data() = 0;
-  virtual const uint8_t* data() const = 0;
+  virtual uint8_t* data() const = 0;
+  virtual const uint8_t* const_data() const = 0;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_CAPTURE_VIDEO_VIDEO_CAPTURE_BUFFER_HANDLE_H_