Remove delta_q experimental flag.

Change-Id: I52f204000f5fdaf1c6fff63949d72e858ceea462
diff --git a/av1/encoder/bitstream.c b/av1/encoder/bitstream.c
index c8fa96b..0b5e561 100644
--- a/av1/encoder/bitstream.c
+++ b/av1/encoder/bitstream.c
@@ -514,7 +514,6 @@
 #endif
 #endif  // CONFIG_MOTION_VAR || CONFIG_WARPED_MOTION
 
-#if CONFIG_DELTA_Q
 static void write_delta_qindex(const AV1_COMMON *cm, const MACROBLOCKD *xd,
                                int delta_qindex, aom_writer *w) {
   int sign = delta_qindex < 0;
@@ -562,7 +561,6 @@
   }
 }
 #endif  // CONFIG_EXT_DELTA_Q
-#endif  // CONFIG_DELTA_Q
 
 #if !CONFIG_NEW_MULTISYMBOL
 static void update_skip_probs(AV1_COMMON *cm, aom_writer *w,
@@ -1717,7 +1715,6 @@
 #else
   skip = write_skip(cm, xd, segment_id, mi, w);
 #endif  // CONFIG_SUPERTX
-#if CONFIG_DELTA_Q
   if (cm->delta_q_present_flag) {
     int super_block_upper_left =
         ((mi_row & MAX_MIB_MASK) == 0) && ((mi_col & MAX_MIB_MASK) == 0);
@@ -1738,7 +1735,6 @@
 #endif  // CONFIG_EXT_DELTA_Q
     }
   }
-#endif
 
 #if CONFIG_SUPERTX
   if (!supertx_enabled)
@@ -2112,12 +2108,7 @@
 #endif  // !CONFIG_TXK_SEL
 }
 
-static void write_mb_modes_kf(AV1_COMMON *cm,
-#if CONFIG_DELTA_Q
-                              MACROBLOCKD *xd,
-#else
-                              const MACROBLOCKD *xd,
-#endif  // CONFIG_DELTA_Q
+static void write_mb_modes_kf(AV1_COMMON *cm, MACROBLOCKD *xd,
 #if CONFIG_INTRABC
                               const MB_MODE_INFO_EXT *mbmi_ext,
 #endif  // CONFIG_INTRABC
@@ -2141,7 +2132,6 @@
 
   if (seg->update_map) write_segment_id(w, seg, segp, mbmi->segment_id);
 
-#if CONFIG_DELTA_Q
   const int skip = write_skip(cm, xd, mbmi->segment_id, mi, w);
   if (cm->delta_q_present_flag) {
     int super_block_upper_left =
@@ -2163,9 +2153,6 @@
 #endif  // CONFIG_EXT_DELTA_Q
     }
   }
-#else
-  write_skip(cm, xd, mbmi->segment_id, mi, w);
-#endif
 
   int enable_tx_size = cm->tx_mode == TX_MODE_SELECT &&
 #if CONFIG_CB4X4 && (CONFIG_VAR_TX || CONFIG_RECT_TX)
@@ -3233,7 +3220,6 @@
 #if CONFIG_PVQ
   assert(cpi->td.mb.pvq_q->curr_pos == 0);
 #endif
-#if CONFIG_DELTA_Q
   if (cpi->common.delta_q_present_flag) {
     xd->prev_qindex = cpi->common.base_qindex;
 #if CONFIG_EXT_DELTA_Q
@@ -3242,7 +3228,6 @@
     }
 #endif  // CONFIG_EXT_DELTA_Q
   }
-#endif
 
   for (mi_row = mi_row_start; mi_row < mi_row_end; mi_row += cm->mib_size) {
     av1_zero_left_context(xd);
@@ -4727,7 +4712,6 @@
   encode_loopfilter(cm, wb);
   encode_quantization(cm, wb);
   encode_segmentation(cm, xd, wb);
-#if CONFIG_DELTA_Q
   {
     int i;
     struct segmentation *const seg = &cm->seg;
@@ -4756,7 +4740,6 @@
       }
     }
   }
-#endif
 #if CONFIG_CDEF
   if (!cm->all_lossless) {
     encode_cdef(cm, wb);
@@ -5086,7 +5069,6 @@
   encode_loopfilter(cm, wb);
   encode_quantization(cm, wb);
   encode_segmentation(cm, xd, wb);
-#if CONFIG_DELTA_Q
   {
     int i;
     struct segmentation *const seg = &cm->seg;
@@ -5115,7 +5097,6 @@
       }
     }
   }
-#endif
 #if CONFIG_CDEF
   if (!cm->all_lossless) {
     encode_cdef(cm, wb);