Implement updated method overriding rules in the vm.

runtime/lib/collection_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class HashMap<K, V> {
   final _HashMapTable<K, V> _hashTable = new _HashMapTable<K, V>();
 
   /* patch */ HashMap() {
     _hashTable._container = this;
   }
@@ skipping 137 matching lines @@
       _table._checkCapacity();
     }
   }
 
   /* patch */ bool remove(Object object) {
     int offset = _table._remove(object);
     _table._checkCapacity();
     return offset >= 0;
   }
 
-  /* patch */ void removeAll(Iterable objectsToRemove) {
+  /* patch */ void removeAll(Iterable<Object> objectsToRemove) {
     for (Object object in objectsToRemove) {
       _table._remove(object);
       _table._checkCapacity();
     }
   }
 
   void _filterWhere(bool test(E element), bool removeMatching) {
     int entrySize = _table._entrySize;
     int length = _table._table.length;
     for (int offset =  0; offset < length; offset += entrySize) {
@@ skipping 832 matching lines @@
 
   _LinkedHashMapTable() : super(_INITIAL_CAPACITY);
 
   V _value(int offset) => _table[offset + _VALUE_INDEX];
   void _setValue(int offset, V value) { _table[offset + _VALUE_INDEX] = value; }
 
   _copyEntry(List oldTable, int fromOffset, int toOffset) {
     _table[toOffset + _VALUE_INDEX] = oldTable[fromOffset + _VALUE_INDEX];
   }
 }