guava-gwt/src-super/com/google/common/collect/super/com/google/common/collect/ForwardingSortedMultiset.java
protected Entry<E> standardPollLastEntry() {
    Iterator<Entry<E>> entryIterator = descendingMultiset().entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }
    Entry<E> entry = entryIterator.next();
    entry = Multisets.immutableEntry(entry.getElement(), entry.getCount());
    entryIterator.remove();
    return entry;
  }
protected Entry<E> standardPollLastEntry() {
    Iterator<Entry<E>> entryIterator = descendingMultiset().entrySet().iterator();
    if (!entryIterator.hasNext()) {
      return null;
    }
    Entry<E> entry = entryIterator.next();
    entry = Multisets.immutableEntry(entry.getElement(), entry.getCount());
    entryIterator.remove();
    return entry;
  }
A sensible definition of {@link #pollLastEntry()} in terms of {@code
descendingMultiset().entrySet().iterator()}.

<p>If you override {@link #descendingMultiset()} or {@link #entrySet()}, you may wish to
override {@link #pollLastEntry()} to forward to this implementation.