Cleanup deprecated comments

Change-Id: I91f18c498c694829b933bb73812ad94d66962994
diff --git a/av1/common/blockd.h b/av1/common/blockd.h
index 5a2579e..3368eb5 100644
--- a/av1/common/blockd.h
+++ b/av1/common/blockd.h
@@ -926,9 +926,6 @@
   (void)blk_col;
 #endif  // CONFIG_TXK_SEL
 
-  // TODO(sarahparker) This assumes reduced_tx_set_used == 0. I will do a
-  // follow up refactor to make the actual value of reduced_tx_set_used
-  // within this function.
   if (is_inter_block(mbmi) && !av1_ext_tx_used[tx_set_type][mbmi->tx_type])
     return DCT_DCT;
 
diff --git a/av1/decoder/decodeframe.c b/av1/decoder/decodeframe.c
index 450604c..212d953 100644
--- a/av1/decoder/decodeframe.c
+++ b/av1/decoder/decodeframe.c
@@ -2370,7 +2370,6 @@
   seq_params->max_frame_height = max_frame_height;
 #endif
 
-  /* Placeholder for actually reading from the bitstream */
   seq_params->frame_id_numbers_present_flag = aom_rb_read_bit(rb);
   if (seq_params->frame_id_numbers_present_flag) {
     // We must always have delta_frame_id_length < frame_id_length,