persistent_no_trace.cpp:9:1: warning: [blink-gc] Class 'Object' has untraced or not traceable fields.
void Object::Trace(Visitor* visitor) const {
^
./persistent_no_trace.h:22:3: note: [blink-gc] Untraceable field 'm_persistent' declared here:
  Persistent<HeapObject> m_persistent;
  ^
./persistent_no_trace.h:23:3: note: [blink-gc] Untraceable field 'm_weakPersistent' declared here:
  WeakPersistent<HeapObject> m_weakPersistent;
  ^
./persistent_no_trace.h:24:3: note: [blink-gc] Untraceable field 'm_crossThreadPersistent' declared here:
  CrossThreadPersistent<HeapObject> m_crossThreadPersistent;
  ^
./persistent_no_trace.h:25:3: note: [blink-gc] Untraceable field 'm_crossThreadWeakPersistent' declared here:
  CrossThreadWeakPersistent<HeapObject> m_crossThreadWeakPersistent;
  ^
1 warning generated.