Deprecate unused mode count variables

Remove mode_check_freq and mode_test_hit_counts from VP9_COMP.

Change-Id: Iabfd9f841444cd9bf19ac761a9795f140082ce0b

vp9/encoder/vp9_onyx_if.c

@@ -698,12 +698,8 @@ void vp9_set_speed_features(VP9_COMP *cpi) {
   if (mode > 1)
     mode = 1;
 
-  // Initialise default mode frequency sampling variables
-  for (i = 0; i < MAX_MODES; i ++) {
-    cpi->mode_check_freq[i] = 0;
-    cpi->mode_test_hit_counts[i] = 0;
+  for (i = 0; i < MAX_MODES; ++i)
     cpi->mode_chosen_counts[i] = 0;
-  }
 
   // best quality defaults
   sf->RD = 1;

vp9/encoder/vp9_onyx_int.h

@@ -363,8 +363,6 @@ typedef struct VP9_COMP {
   // Ambient reconstruction err target for force key frames
   int ambient_err;
 
-  unsigned int mode_check_freq[MAX_MODES];
-  unsigned int mode_test_hit_counts[MAX_MODES];
   unsigned int mode_chosen_counts[MAX_MODES];
   int64_t mode_skip_mask;
   int ref_frame_mask;