[ot] Simplify normalization_preference again

No shaper has more than one behavior re this, so no need for a callback.

src/hb-ot-shape-complex-arabic.cc

diff --git a/src/hb-ot-shape-complex-arabic.cc b/src/hb-ot-shape-complex-arabic.cc
index 4f6c86e..f576720 100644
--- a/src/hb-ot-shape-complex-arabic.cc
+++ b/src/hb-ot-shape-complex-arabic.cc
@@ -366,7 +366,7 @@
   data_create_arabic,
   data_destroy_arabic,
   NULL, /* preprocess_text_arabic */
-  NULL, /* normalization_preference */
+  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_arabic,

src/hb-ot-shape-complex-default.cc

diff --git a/src/hb-ot-shape-complex-default.cc b/src/hb-ot-shape-complex-default.cc
index 519790c..dfb28d8 100644
--- a/src/hb-ot-shape-complex-default.cc
+++ b/src/hb-ot-shape-complex-default.cc
@@ -58,12 +58,6 @@
     plan->map.add_global_bool_feature (*script_features);
 }
 
-static hb_ot_shape_normalization_mode_t
-normalization_preference_default (const hb_segment_properties_t *props)
-{
-  return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS;
-}
-
 static bool
 compose_default (const hb_ot_shape_normalize_context_t *c,
 		 hb_codepoint_t  a,
@@ -198,7 +192,7 @@
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
-  normalization_preference_default,
+  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
   NULL, /* decompose */
   compose_default,
   NULL, /* setup_masks */

src/hb-ot-shape-complex-hangul.cc

diff --git a/src/hb-ot-shape-complex-hangul.cc b/src/hb-ot-shape-complex-hangul.cc
index 1b89f20..093f465 100644
--- a/src/hb-ot-shape-complex-hangul.cc
+++ b/src/hb-ot-shape-complex-hangul.cc
@@ -223,7 +223,7 @@
   NULL, /* data_create */
   NULL, /* data_destroy */
   preprocess_text_hangul,
-  NULL, /* normalization_preference */
+  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
   NULL, /* decompose */
   NULL, /* compose */
   NULL, /* setup_masks */

src/hb-ot-shape-complex-indic.cc

diff --git a/src/hb-ot-shape-complex-indic.cc b/src/hb-ot-shape-complex-indic.cc
index 9edefe3..1e07d33 100644
--- a/src/hb-ot-shape-complex-indic.cc
+++ b/src/hb-ot-shape-complex-indic.cc
@@ -1690,12 +1690,6 @@
 }
 
 
-static hb_ot_shape_normalization_mode_t
-normalization_preference_indic (const hb_segment_properties_t *props HB_UNUSED)
-{
-  return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
-}
-
 static bool
 decompose_indic (const hb_ot_shape_normalize_context_t *c,
 		 hb_codepoint_t  ab,
@@ -1806,7 +1800,7 @@
   data_create_indic,
   data_destroy_indic,
   NULL, /* preprocess_text */
-  normalization_preference_indic,
+  HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   decompose_indic,
   compose_indic,
   setup_masks_indic,

src/hb-ot-shape-complex-myanmar.cc

diff --git a/src/hb-ot-shape-complex-myanmar.cc b/src/hb-ot-shape-complex-myanmar.cc
index 25ba726..50209ff 100644
--- a/src/hb-ot-shape-complex-myanmar.cc
+++ b/src/hb-ot-shape-complex-myanmar.cc
@@ -541,13 +541,6 @@
 }
 
 
-static hb_ot_shape_normalization_mode_t
-normalization_preference_myanmar (const hb_segment_properties_t *props HB_UNUSED)
-{
-  return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
-}
-
-
 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_myanmar =
 {
   "myanmar",
@@ -556,7 +549,7 @@
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
-  normalization_preference_myanmar,
+  HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_myanmar,

src/hb-ot-shape-complex-private.hh

diff --git a/src/hb-ot-shape-complex-private.hh b/src/hb-ot-shape-complex-private.hh
index 17b95e2..320c4e6 100644
--- a/src/hb-ot-shape-complex-private.hh
+++ b/src/hb-ot-shape-complex-private.hh
@@ -106,12 +106,7 @@
 			   hb_font_t                *font);
 
 
-  /* normalization_preference()
-   * Called during shape().
-   * May be NULL.
-   */
-  hb_ot_shape_normalization_mode_t
-  (*normalization_preference) (const hb_segment_properties_t *props);
+  hb_ot_shape_normalization_mode_t normalization_preference;
 
   /* decompose()
    * Called during shape()'s normalization.

src/hb-ot-shape-complex-sea.cc

diff --git a/src/hb-ot-shape-complex-sea.cc b/src/hb-ot-shape-complex-sea.cc
index da687ed..6288a90 100644
--- a/src/hb-ot-shape-complex-sea.cc
+++ b/src/hb-ot-shape-complex-sea.cc
@@ -360,13 +360,6 @@
 }
 
 
-static hb_ot_shape_normalization_mode_t
-normalization_preference_sea (const hb_segment_properties_t *props HB_UNUSED)
-{
-  return HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT;
-}
-
-
 const hb_ot_complex_shaper_t _hb_ot_complex_shaper_sea =
 {
   "sea",
@@ -375,7 +368,7 @@
   NULL, /* data_create */
   NULL, /* data_destroy */
   NULL, /* preprocess_text */
-  normalization_preference_sea,
+  HB_OT_SHAPE_NORMALIZATION_MODE_COMPOSED_DIACRITICS_NO_SHORT_CIRCUIT,
   NULL, /* decompose */
   NULL, /* compose */
   setup_masks_sea,

src/hb-ot-shape-complex-thai.cc

diff --git a/src/hb-ot-shape-complex-thai.cc b/src/hb-ot-shape-complex-thai.cc
index 4594533..04ca7ac 100644
--- a/src/hb-ot-shape-complex-thai.cc
+++ b/src/hb-ot-shape-complex-thai.cc
@@ -369,7 +369,7 @@
   NULL, /* data_create */
   NULL, /* data_destroy */
   preprocess_text_thai,
-  NULL, /* normalization_preference */
+  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT,
   NULL, /* decompose */
   NULL, /* compose */
   NULL, /* setup_masks */

src/hb-ot-shape-normalize.cc

diff --git a/src/hb-ot-shape-normalize.cc b/src/hb-ot-shape-normalize.cc
index 6531e1b..9f3cd76 100644
--- a/src/hb-ot-shape-normalize.cc
+++ b/src/hb-ot-shape-normalize.cc
@@ -289,9 +289,7 @@
 			hb_buffer_t *buffer,
 			hb_font_t *font)
 {
-  hb_ot_shape_normalization_mode_t mode = plan->shaper->normalization_preference ?
-					  plan->shaper->normalization_preference (&buffer->props) :
-					  HB_OT_SHAPE_NORMALIZATION_MODE_DEFAULT;
+  hb_ot_shape_normalization_mode_t mode = plan->shaper->normalization_preference;
   const hb_ot_shape_normalize_context_t c = {
     plan,
     buffer,