libvpx: Pull from upstream

source/libvpx/vp8/encoder/boolhuff.h

Index: source/libvpx/vp8/encoder/boolhuff.h
===================================================================
--- source/libvpx/vp8/encoder/boolhuff.h	(revision 290053)
+++ source/libvpx/vp8/encoder/boolhuff.h	(working copy)
@@ -35,10 +35,6 @@
     unsigned char *buffer;
     unsigned char *buffer_end;
     struct vpx_internal_error_info *error;
-
-    /* Variables used to track bit costs without outputing to the bitstream */
-    unsigned int  measure_cost;
-    unsigned long bit_counter;
 } BOOL_CODER;
 
 extern void vp8_start_encode(BOOL_CODER *bc, unsigned char *buffer, unsigned char *buffer_end);