Get rid of HStoreNamedField::SkipWriteBarrier().

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index fd013f96b5a3889dc1faa3d9f09ee3f6fa3724cf..17cb7d1aa156edfc660f1e0ce1236d054d536d35 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1388,18 +1388,9 @@ class HGraphBuilder {
 
   HInstruction* AddLoadStringInstanceType(HValue* string);
   HInstruction* AddLoadStringLength(HValue* string);
-  HStoreNamedField* AddStoreMapNoWriteBarrier(HValue* object, HValue* map) {
-    HStoreNamedField* store_map = Add<HStoreNamedField>(
-        object, HObjectAccess::ForMap(), map);
-    store_map->SkipWriteBarrier();
-    return store_map;
-  }
-  HStoreNamedField* AddStoreMapConstant(HValue* object, Handle<Map> map);
-  HStoreNamedField* AddStoreMapConstantNoWriteBarrier(HValue* object,
-                                                      Handle<Map> map) {
-    HStoreNamedField* store_map = AddStoreMapConstant(object, map);
-    store_map->SkipWriteBarrier();
-    return store_map;
+  HStoreNamedField* AddStoreMapConstant(HValue* object, Handle<Map> map) {
+    return Add<HStoreNamedField>(object, HObjectAccess::ForMap(),
+                                 Add<HConstant>(map));
   }
   HLoadNamedField* AddLoadElements(HValue* object,
                                    HValue* dependency = NULL);