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diff --git a/third_party/aom/aom_dsp/grain_synthesis.h b/third_party/aom/aom_dsp/grain_synthesis.h
deleted file mode 100644
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--- a/third_party/aom/aom_dsp/grain_synthesis.h
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@@ -1,122 +0,0 @@
-/*
- * Copyright (c) 2016, Alliance for Open Media. All rights reserved
- *
- * This source code is subject to the terms of the BSD 2 Clause License and
- * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
- * was not distributed with this source code in the LICENSE file, you can
- * obtain it at www.aomedia.org/license/software. If the Alliance for Open
- * Media Patent License 1.0 was not distributed with this source code in the
- * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
- */
-
-/*!\file
- * \brief Describes film grain parameters and film grain synthesis
- *
- */
-#ifndef AOM_AOM_DSP_GRAIN_SYNTHESIS_H_
-#define AOM_AOM_DSP_GRAIN_SYNTHESIS_H_
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "aom_dsp/aom_dsp_common.h"
-#include "aom/aom_image.h"
-
-/*!\brief Structure containing film grain synthesis parameters for a frame
- *
- * This structure contains input parameters for film grain synthesis
- */
-typedef struct {
-  int apply_grain;
-
-  int update_parameters;
-
-  // 8 bit values
-  int scaling_points_y[14][2];
-  int num_y_points;  // value: 0..14
-
-  // 8 bit values
-  int scaling_points_cb[10][2];
-  int num_cb_points;  // value: 0..10
-
-  // 8 bit values
-  int scaling_points_cr[10][2];
-  int num_cr_points;  // value: 0..10
-
-  int scaling_shift;  // values : 8..11
-
-  int ar_coeff_lag;  // values:  0..3
-
-  // 8 bit values
-  int ar_coeffs_y[24];
-  int ar_coeffs_cb[25];
-  int ar_coeffs_cr[25];
-
-  // Shift value: AR coeffs range
-  // 6: [-2, 2)
-  // 7: [-1, 1)
-  // 8: [-0.5, 0.5)
-  // 9: [-0.25, 0.25)
-  int ar_coeff_shift;  // values : 6..9
-
-  int cb_mult;       // 8 bits
-  int cb_luma_mult;  // 8 bits
-  int cb_offset;     // 9 bits
-
-  int cr_mult;       // 8 bits
-  int cr_luma_mult;  // 8 bits
-  int cr_offset;     // 9 bits
-
-  int overlap_flag;
-
-  int clip_to_restricted_range;
-
-  unsigned int bit_depth;  // video bit depth
-
-  int chroma_scaling_from_luma;
-
-  int grain_scale_shift;
-
-  uint16_t random_seed;
-} aom_film_grain_t;
-
-/*!\brief Add film grain
- *
- * Add film grain to an image
- *
- * Returns 0 for success, -1 for failure
- *
- * \param[in]    grain_params     Grain parameters
- * \param[in]    luma             luma plane
- * \param[in]    cb               cb plane
- * \param[in]    cr               cr plane
- * \param[in]    height           luma plane height
- * \param[in]    width            luma plane width
- * \param[in]    luma_stride      luma plane stride
- * \param[in]    chroma_stride    chroma plane stride
- */
-int av1_add_film_grain_run(const aom_film_grain_t *grain_params, uint8_t *luma,
-                           uint8_t *cb, uint8_t *cr, int height, int width,
-                           int luma_stride, int chroma_stride,
-                           int use_high_bit_depth, int chroma_subsamp_y,
-                           int chroma_subsamp_x, int mc_identity);
-
-/*!\brief Add film grain
- *
- * Add film grain to an image
- *
- * Returns 0 for success, -1 for failure
- *
- * \param[in]    grain_params     Grain parameters
- * \param[in]    src              Source image
- * \param[out]   dst              Resulting image with grain
- */
-int av1_add_film_grain(const aom_film_grain_t *grain_params,
-                       const aom_image_t *src, aom_image_t *dst);
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
-
-#endif  // AOM_AOM_DSP_GRAIN_SYNTHESIS_H_