android/guava/src/com/google/common/collect/Maps.java
static boolean containsValueImpl(Map<?, ?> map, @NullableDecl Object value) {
    return Iterators.contains(valueIterator(map.entrySet().iterator()), value);
  }
static boolean containsValueImpl(Map<?, ?> map, @NullableDecl Object value) {
    return Iterators.contains(valueIterator(map.entrySet().iterator()), value);
  }
An implementation of {@link Map#containsValue}.