removeListener method

@override void removeListener()

Implementation

@override
void removeListener() {
  Log(tag).i("tab is listener remove");
  removeListenerFlag = true;
  if (kIsWeb) {
    document.removeEventListener("visibility-change", (event) => {
      Log(tag).i("changeability is remove")
    });
    window.removeEventListener('visibility-change', (event) => {
      Log(tag).i("visibility-change listener remove")

    });
  }
}