Removing dummy assignments.

Change-Id: I10d1a4bcac751a982d9dd135f019e3a4d92f8522

vp9/common/vp9_alloccommon.c

@@ -200,9 +200,6 @@ int vp9_alloc_frame_buffers(VP9_COMMON *cm, int width, int height) {
 
 void vp9_create_common(VP9_COMMON *cm) {
   vp9_machine_specific_config(cm);
-
-  cm->tx_mode = ONLY_4X4;
-  cm->comp_pred_mode = REFERENCE_MODE_SELECT;
 }
 
 void vp9_remove_common(VP9_COMMON *cm) {