Refactor Map, Set implementations.

- Implement LinkedHashMap.EntrySet.remove method
- Implement clear and remove methods for
  AbstractMap's keySet() and values()
- Remove initialization block in LinkedHashMap
- Ignore capacity and loadFactor parameters in
  LinkedHashSet
- Remove toArray method in Collections.SetFromMap

Change-Id: Ie590954cb37356269489be385c14379313934df7
5 files changed