Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-ot-head-table.hh

Index: third_party/harfbuzz-ng/src/hb-ot-head-table.hh
diff --git a/third_party/harfbuzz-ng/src/hb-ot-head-private.hh b/third_party/harfbuzz-ng/src/hb-ot-head-table.hh
similarity index 96%
rename from third_party/harfbuzz-ng/src/hb-ot-head-private.hh
rename to third_party/harfbuzz-ng/src/hb-ot-head-table.hh
index 3a4bbbf963b3683bb96f44b069142157bab838ef..a4d8d5f110d208949f506fdec106ef4273708e9c 100644
--- a/third_party/harfbuzz-ng/src/hb-ot-head-private.hh
+++ b/third_party/harfbuzz-ng/src/hb-ot-head-table.hh
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2010  Red Hat, Inc.
+ * Copyright © 2010  Red Hat, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -24,16 +24,15 @@
  * Red Hat Author(s): Behdad Esfahbod
  */
 
-#ifndef HB_OT_HEAD_PRIVATE_HH
-#define HB_OT_HEAD_PRIVATE_HH
+#ifndef HB_OT_HEAD_TABLE_HH
+#define HB_OT_HEAD_TABLE_HH
 
 #include "hb-open-type-private.hh"
 
-HB_BEGIN_DECLS
 
 
 /*
- * head
+ * head -- Font Header
  */
 
 #define HB_OT_TAG_head HB_TAG('h','e','a','d')
@@ -50,7 +49,6 @@ struct head
 
   inline bool sanitize (hb_sanitize_context_t *c) {
     TRACE_SANITIZE ();
-    /* Shall we check for magicNumber here?  Who cares? */
     return c->check_struct (this) && likely (version.major == 1);
   }
 
@@ -141,6 +139,5 @@ struct head
 };
 
 
-HB_END_DECLS
 
-#endif /* HB_OT_HEAD_PRIVATE_HH */
+#endif /* HB_OT_HEAD_TABLE_HH */