Speculatively revert "Make the object store visible in Observatory."

runtime/vm/object_store.cc

Index: runtime/vm/object_store.cc
diff --git a/runtime/vm/object_store.cc b/runtime/vm/object_store.cc
index bc05829e60693b36b4e6595f98e22020be21ce5e..9affdcb0fd0f881663df459f2911fa1d17529c94 100644
--- a/runtime/vm/object_store.cc
+++ b/runtime/vm/object_store.cc
@@ -120,25 +120,6 @@ void ObjectStore::Init(Isolate* isolate) {
 }
 
 
-void ObjectStore::PrintToJSONObject(JSONObject* jsobj, bool ref) {
-  if (!FLAG_support_service) {
-    return;
-  }
-  jsobj->AddProperty("type", (ref ? "@_ObjectStore" : "_ObjectStore"));
-  jsobj->AddFixedServiceId("object_store");
-
-  {
-    JSONObject fields(jsobj, "fields");
-    Object& value = Object::Handle();
-#define PRINT_OBJECT_STORE_FIELD(type, name)                                   \
-    value = name;                                                              \
-    fields.AddProperty(#name, value);
-OBJECT_STORE_FIELD_LIST(PRINT_OBJECT_STORE_FIELD);
-#undef PRINT_OBJECT_STORE_FIELD
-  }
-}
-
-
 RawError* ObjectStore::PreallocateObjects() {
   Thread* thread = Thread::Current();
   Isolate* isolate = thread->isolate();