Revert of Extract bitrate allocation of spatial/temporal layers out of codec impl.

webrtc/common_video/include/video_bitrate_allocator.h

-/*
- *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_BITRATE_ALLOCATOR_H_
-#define WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_BITRATE_ALLOCATOR_H_
-
-#include "webrtc/common_types.h"
-
-namespace webrtc {
-
-class VideoBitrateAllocator {
- public:
-  VideoBitrateAllocator() {}
-  virtual ~VideoBitrateAllocator() {}
-
-  virtual BitrateAllocation GetAllocation(uint32_t total_bitrate,
-                                          uint32_t framerate) = 0;
-  virtual uint32_t GetPreferredBitrateBps(uint32_t framerate) = 0;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_COMMON_VIDEO_INCLUDE_VIDEO_BITRATE_ALLOCATOR_H_