android/guava/src/com/google/common/collect/AbstractMapBasedMultimap.java
private void removeValuesForKey(Object key) {
    Collection<V> collection = Maps.safeRemove(map, key);

    if (collection != null) {
      int count = collection.size();
      collection.clear();
      totalSize -= count;
    }
  }
private void removeValuesForKey(Object key) {
    Collection<V> collection = Maps.safeRemove(map, key);

    if (collection != null) {
      int count = collection.size();
      collection.clear();
      totalSize -= count;
    }
  }
Removes all values for the provided key.