unregister method
Implementation
void unregister(Object token) {
_restartVisibilityTimerCallbacks.remove(token);
_showControlsCallbacks.remove(token);
_hideControlsCallbacks.remove(token);
_setControlsPinnedCallbacks.remove(token);
}
void unregister(Object token) {
_restartVisibilityTimerCallbacks.remove(token);
_showControlsCallbacks.remove(token);
_hideControlsCallbacks.remove(token);
_setControlsPinnedCallbacks.remove(token);
}