libvpx: Pull from upstream

source/libvpx/vp9/encoder/vp9_treewriter.h

Index: source/libvpx/vp9/encoder/vp9_treewriter.h
===================================================================
--- source/libvpx/vp9/encoder/vp9_treewriter.h	(revision 263011)
+++ source/libvpx/vp9/encoder/vp9_treewriter.h	(working copy)
@@ -17,35 +17,6 @@
 extern "C" {
 #endif
 
-#define vp9_cost_zero(prob) (vp9_prob_cost[prob])
-
-#define vp9_cost_one(prob) vp9_cost_zero(vp9_complement(prob))
-
-#define vp9_cost_bit(prob, bit) vp9_cost_zero((bit) ? vp9_complement(prob) \
-                                                    : (prob))
-
-static INLINE unsigned int cost_branch256(const unsigned int ct[2],
-                                          vp9_prob p) {
-  return ct[0] * vp9_cost_zero(p) + ct[1] * vp9_cost_one(p);
-}
-
-static INLINE int treed_cost(vp9_tree tree, const vp9_prob *probs,
-                             int bits, int len) {
-  int cost = 0;
-  vp9_tree_index i = 0;
-
-  do {
-    const int bit = (bits >> --len) & 1;
-    cost += vp9_cost_bit(probs[i >> 1], bit);
-    i = tree[i + bit];
-  } while (len);
-
-  return cost;
-}
-
-void vp9_cost_tokens(int *costs, const vp9_prob *probs, vp9_tree tree);
-void vp9_cost_tokens_skip(int *costs, const vp9_prob *probs, vp9_tree tree);
-
 void vp9_tree_probs_from_distribution(vp9_tree tree,
                                       unsigned int branch_ct[ /* n - 1 */ ][2],
                                       const unsigned int num_events[ /* n */ ]);