android/guava/src/com/google/common/collect/Iterables.java
@Deprecated
  public static <E> Iterable<E> unmodifiableIterable(ImmutableCollection<E> iterable) {
    return checkNotNull(iterable);
  }
@Deprecated
  public static <E> Iterable<E> unmodifiableIterable(ImmutableCollection<E> iterable) {
    return checkNotNull(iterable);
  }
Simply returns its argument.

@deprecated no need to use this
@since 10.0