Remove extra enum

VP8_REFFRAME is the same as vpx_ref_frame_type

Change-Id: I63c2ddfb39f6ec87d1e5eb6a8852846464552b1b
diff --git a/vp8/vp8_cx_iface.c b/vp8/vp8_cx_iface.c
index ca06648..472db6e37 100644
--- a/vp8/vp8_cx_iface.c
+++ b/vp8/vp8_cx_iface.c
@@ -771,13 +771,13 @@
         int ref = 7;
 
         if (flags & VP8_EFLAG_NO_REF_LAST)
-            ref ^= VP8_LAST_FLAG;
+            ref ^= VP8_LAST_FRAME;
 
         if (flags & VP8_EFLAG_NO_REF_GF)
-            ref ^= VP8_GOLD_FLAG;
+            ref ^= VP8_GOLD_FRAME;
 
         if (flags & VP8_EFLAG_NO_REF_ARF)
-            ref ^= VP8_ALT_FLAG;
+            ref ^= VP8_ALTR_FRAME;
 
         vp8_use_as_reference(ctx->cpi, ref);
     }
@@ -789,13 +789,13 @@
         int upd = 7;
 
         if (flags & VP8_EFLAG_NO_UPD_LAST)
-            upd ^= VP8_LAST_FLAG;
+            upd ^= VP8_LAST_FRAME;
 
         if (flags & VP8_EFLAG_NO_UPD_GF)
-            upd ^= VP8_GOLD_FLAG;
+            upd ^= VP8_GOLD_FRAME;
 
         if (flags & VP8_EFLAG_NO_UPD_ARF)
-            upd ^= VP8_ALT_FLAG;
+            upd ^= VP8_ALTR_FRAME;
 
         vp8_update_reference(ctx->cpi, upd);
     }