[rename] Rename internal field to embedder field.

src/ffi/ffi-compiler.cc

Index: src/ffi/ffi-compiler.cc
diff --git a/src/ffi/ffi-compiler.cc b/src/ffi/ffi-compiler.cc
index d7fdbb957de122b95dc267620132d987fdeae933..a526ce3d4b0c5fafd86ddebed9699b7ee033993b 100644
--- a/src/ffi/ffi-compiler.cc
+++ b/src/ffi/ffi-compiler.cc
@@ -16,14 +16,14 @@ void InstallFFIMap(Isolate* isolate) {
   Handle<Map> prev_map = Handle<Map>(context->sloppy_function_map(), isolate);
 
   InstanceType instance_type = prev_map->instance_type();
-  int internal_fields = JSObject::GetInternalFieldCount(*prev_map);
-  CHECK_EQ(0, internal_fields);
+  int embedder_fields = JSObject::GetEmbedderFieldCount(*prev_map);
+  CHECK_EQ(0, embedder_fields);
   int pre_allocated =
       prev_map->GetInObjectProperties() - prev_map->unused_property_fields();
   int instance_size;
   int in_object_properties;
   JSFunction::CalculateInstanceSizeHelper(
-      instance_type, internal_fields, 0, &instance_size, &in_object_properties);
+      instance_type, embedder_fields, 0, &instance_size, &in_object_properties);
   int unused_property_fields = in_object_properties - pre_allocated;
   Handle<Map> map = Map::CopyInitialMap(
       prev_map, instance_size, in_object_properties, unused_property_fields);