Update harfbuzz-ng to 1a5a91dc0d8bf4b72a2f22dc6300b06ad7000b79.

third_party/harfbuzz-ng/src/hb-blob.h

Index: third_party/harfbuzz-ng/src/hb-blob.h
diff --git a/third_party/harfbuzz-ng/src/hb-blob.h b/third_party/harfbuzz-ng/src/hb-blob.h
index dbbfc90a1f2c2cbd6a2f528d95be3f2ddbd948f5..50c9ae3bcfaeb0ea86d07d4a3bcefc07bd1ed635 100644
--- a/third_party/harfbuzz-ng/src/hb-blob.h
+++ b/third_party/harfbuzz-ng/src/hb-blob.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009  Red Hat, Inc.
+ * Copyright © 2009  Red Hat, Inc.
  *
  *  This is part of HarfBuzz, a text shaping library.
  *
@@ -45,8 +45,8 @@ hb_blob_t *
 hb_blob_create (const char        *data,
 		unsigned int       length,
 		hb_memory_mode_t   mode,
-		hb_destroy_func_t  destroy,
-		void              *user_data);
+		void              *user_data,
+		hb_destroy_func_t  destroy);
 
 hb_blob_t *
 hb_blob_create_sub_blob (hb_blob_t    *parent,
@@ -54,34 +54,42 @@ hb_blob_create_sub_blob (hb_blob_t    *parent,
 			 unsigned int  length);
 
 hb_blob_t *
-hb_blob_create_empty (void);
+hb_blob_get_empty (void);
 
 hb_blob_t *
 hb_blob_reference (hb_blob_t *blob);
 
-unsigned int
-hb_blob_get_reference_count (hb_blob_t *blob);
-
 void
 hb_blob_destroy (hb_blob_t *blob);
 
-unsigned int
-hb_blob_get_length (hb_blob_t *blob);
+hb_bool_t
+hb_blob_set_user_data (hb_blob_t          *blob,
+		       hb_user_data_key_t *key,
+		       void *              data,
+		       hb_destroy_func_t   destroy,
+		       hb_bool_t           replace);
+
+
+void *
+hb_blob_get_user_data (hb_blob_t          *blob,
+		       hb_user_data_key_t *key);
 
-const char *
-hb_blob_lock (hb_blob_t *blob);
 
 void
-hb_blob_unlock (hb_blob_t *blob);
+hb_blob_make_immutable (hb_blob_t *blob);
 
 hb_bool_t
-hb_blob_is_writable (hb_blob_t *blob);
+hb_blob_is_immutable (hb_blob_t *blob);
 
-hb_bool_t
-hb_blob_try_writable_inplace (hb_blob_t *blob);
 
-hb_bool_t
-hb_blob_try_writable (hb_blob_t *blob);
+unsigned int
+hb_blob_get_length (hb_blob_t *blob);
+
+const char *
+hb_blob_get_data (hb_blob_t *blob, unsigned int *length);
+
+char *
+hb_blob_get_data_writable (hb_blob_t *blob, unsigned int *length);
 
 
 HB_END_DECLS