public void notifyRemoved(ObservableList list, int start, int count) {
        ListChanges listChanges = acquire(start, 0, count);
        notifyCallbacks(list, REMOVED, listChanges);
    }
Notify registered callbacks that elements were deleted.

@param list  The list that changed.
@param start The index of the first element to be removed.
@param count The number of elements removed.
android/android_framework/base/src/main/java/github/tornaco/android/thanos/core/util/obs/ListChangeRegistry.java