Use term 'restoration unit' consistently.

In place of 'restoration tile'.

Change-Id: I643acc64fbb18f1c0028914ef04fdd5af066aa1f

av1/encoder/bitstream.c

diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index 8add2cc..a32317a 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -1731,9 +1731,9 @@
       const int rstride = cm->rst_info[plane].horz_units_per_tile;
       for (int rrow = rrow0; rrow < rrow1; ++rrow) {
         for (int rcol = rcol0; rcol < rcol1; ++rcol) {
-          const int rtile_idx = tile_tl_idx + rcol + rrow * rstride;
+          const int runit_idx = tile_tl_idx + rcol + rrow * rstride;
           const RestorationUnitInfo *rui =
-              &cm->rst_info[plane].unit_info[rtile_idx];
+              &cm->rst_info[plane].unit_info[runit_idx];
           loop_restoration_write_sb_coeffs(cm, xd, rui, w, plane);
         }
       }
@@ -1889,7 +1889,7 @@
     RestorationInfo *rsi = &cm->rst_info[0];
 
     assert(rsi->restoration_unit_size >= sb_size);
-    assert(RESTORATION_TILESIZE_MAX == 256);
+    assert(RESTORATION_UNITSIZE_MAX == 256);
 
     if (sb_size == 64) {
       aom_wb_write_bit(wb, rsi->restoration_unit_size > 64);