libvpx: Pull from upstream

source/libvpx/vp9/decoder/vp9_decoder.h

 /*
  *  Copyright (c) 2010 The WebM 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.
  */
 
@@ skipping 56 matching lines @@
                       vp9_ppflags_t *flags);
 
 vpx_codec_err_t vp9_copy_reference_dec(struct VP9Decoder *pbi,
                                        VP9_REFFRAME ref_frame_flag,
                                        YV12_BUFFER_CONFIG *sd);
 
 vpx_codec_err_t vp9_set_reference_dec(VP9_COMMON *cm,
                                       VP9_REFFRAME ref_frame_flag,
                                       YV12_BUFFER_CONFIG *sd);
 
-int vp9_get_reference_dec(struct VP9Decoder *pbi,
-                          int index, YV12_BUFFER_CONFIG **fb);
-
 struct VP9Decoder *vp9_decoder_create();
 
 void vp9_decoder_remove(struct VP9Decoder *pbi);
 
 #ifdef __cplusplus
 }  // extern "C"
 #endif
 
 #endif  // VP9_DECODER_VP9_DECODER_H_