src: use BaseObject::kInteralFieldCount in Blob

Instead of hard-coding the field count.

PR-URL: #36991
Backport-PR-URL: #39704
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>

src/node_blob.cc

@@ -38,7 +38,8 @@ Local<FunctionTemplate> Blob::GetConstructorTemplate(Environment* env) {
   Local<FunctionTemplate> tmpl = env->blob_constructor_template();
   if (tmpl.IsEmpty()) {
     tmpl = FunctionTemplate::New(env->isolate());
-    tmpl->InstanceTemplate()->SetInternalFieldCount(1);
+    tmpl->InstanceTemplate()->SetInternalFieldCount(
+        BaseObject::kInternalFieldCount);
     tmpl->Inherit(BaseObject::GetConstructorTemplate(env));
     tmpl->SetClassName(
         FIXED_ONE_BYTE_STRING(env->isolate(), "Blob"));