Roll HarfBuzz to 1.2.6

third_party/harfbuzz-ng/src/hb-fallback-shape.cc

Index: third_party/harfbuzz-ng/src/hb-fallback-shape.cc
diff --git a/third_party/harfbuzz-ng/src/hb-fallback-shape.cc b/third_party/harfbuzz-ng/src/hb-fallback-shape.cc
index b5ebfc0466631339c8000b8b9f7427ff672ed14d..e2ad2400167188b7fd1a6ddc393f8fa1c78c10bb 100644
--- a/third_party/harfbuzz-ng/src/hb-fallback-shape.cc
+++ b/third_party/harfbuzz-ng/src/hb-fallback-shape.cc
@@ -106,7 +106,7 @@ _hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
    */
 
   hb_codepoint_t space;
-  bool has_space = (bool) font->get_glyph (' ', 0, &space);
+  bool has_space = (bool) font->get_nominal_glyph (' ', &space);
 
   buffer->clear_positions ();
 
@@ -123,7 +123,7 @@ _hb_fallback_shape (hb_shape_plan_t    *shape_plan HB_UNUSED,
       pos[i].y_advance = 0;
       continue;
     }
-    font->get_glyph (info[i].codepoint, 0, &info[i].codepoint);
+    font->get_nominal_glyph (info[i].codepoint, &info[i].codepoint);
     font->get_glyph_advance_for_direction (info[i].codepoint,
 					   direction,
 					   &pos[i].x_advance,