Remove unused FRAME_CONTEXT_INDEX typedef

Change-Id: I26cf6510ddc1c0534ad9ff7a40cb1aabe7f13810
diff --git a/av1/encoder/encode_strategy.c b/av1/encoder/encode_strategy.c
index 11af10f..98e26ef 100644
--- a/av1/encoder/encode_strategy.c
+++ b/av1/encoder/encode_strategy.c
@@ -250,8 +250,7 @@
 
   // Find the most recent reference frame with the same reference type as the
   // current frame
-  FRAME_CONTEXT_INDEX current_ref_type =
-      get_current_frame_ref_type(cpi, frame_params);
+  const int current_ref_type = get_current_frame_ref_type(cpi, frame_params);
   int wanted_fb = cpi->fb_of_context_type[current_ref_type];
 
   int primary_ref_frame = PRIMARY_REF_NONE;
diff --git a/av1/encoder/encoder.h b/av1/encoder/encoder.h
index 8bed863..75cc141 100644
--- a/av1/encoder/encoder.h
+++ b/av1/encoder/encoder.h
@@ -76,16 +76,6 @@
 } CODING_CONTEXT;
 
 enum {
-  REGULAR_FRAME,       // regular inter frame
-  ARF_FRAME,           // alternate reference frame
-  OVERLAY_FRAME,       // overlay frame
-  GLD_FRAME,           // golden frame
-  BRF_FRAME,           // backward reference frame
-  INTERNAL_ARF_FRAME,  // internal alternate reference frame
-  FRAME_CONTEXT_INDEXES
-} UENUM1BYTE(FRAME_CONTEXT_INDEX);
-
-enum {
   NORMAL = 0,
   FOURFIVE = 1,
   THREEFIVE = 2,