Remove unused dom/common files.

client/dom/common/implementation.dart

-class ListBase<E> extends DOMType implements List<E> {
-  ListBase();
-
-  void forEach(void f(E element)) => Collections.forEach(this, f);
-  Collection map(f(E element)) => Collections.map(this, [], f);
-  Collection<E> filter(bool f(E element)) => Collections.filter(this, [], f);
-  bool every(bool f(E element)) => Collections.every(this, f);
-  bool some(bool f(E element)) => Collections.some(this, f);
-  bool isEmpty() => Collections.isEmpty(this);
-
-  void sort(int compare(E a, E b)) {
-    throw 'Unsupported yet';
-  }
-
-  void copyFrom(List<Object> src, int srcStart, int dstStart, int count) {
-    Arrays.copy(src, srcStart, this, dstStart, count);
-  }
-
-  int indexOf(E element, int startIndex) {
-    // FIXME: switch to dart:coreimpl when de'Array'ed.
-    if (startIndex >= length) {
-      return -1;
-    }
-    if (startIndex < 0) {
-      startIndex = 0;
-    }
-    for (int i = startIndex; i < length; i++) {
-      if (this[i] == element) {
-        return i;
-      }
-    }
-    return -1;
-  }
-
-  int lastIndexOf(E element, int startIndex) {
-    // FIXME: switch to dart:coreimpl when de'Array'ed.
-    if (startIndex < 0) {
-      return -1;
-    }
-    if (startIndex >= length) {
-      startIndex = length - 1;
-    }
-    for (int i = startIndex; i >= 0; i--) {
-      if (this[i] == element) {
-        return i;
-      }
-    }
-    return -1;
-  }
-
-  E last() => this[length - 1];
-
-  // FIXME: implement those.
-  void setRange(int start, int length, List<E> from, [int startFrom]) {
-    throw const NotImplementedException();
-  }
-  void removeRange(int start, int length) {
-    throw const NotImplementedException();
-  }
-  void insertRange(int start, int length, [E initialValue]) {
-    throw const NotImplementedException();
-  }
-  List<E> getRange(int start, int length) {
-    throw const NotImplementedException();
-  }
-
-  Iterator<E> iterator() {
-    // Note: NodeLists are not fixed size. And most probably length shouldn't
-    // be cached in both iterator _and_ forEach method. For now caching it
-    // for consistency.
-    return new _FixedSizeListIterator<E>(this);
-  }
-}
-
-// FIXME: switch to one from dart:coreimpl when DartVM is de'Array'ed.
-// Iterator for lists with fixed size.
-class _FixedSizeListIterator<E> implements Iterator<E> {
-  _FixedSizeListIterator(List list)
-      : _list = list, _length = list.length, _pos = 0 {
-  }
-
-  bool hasNext() => _length > _pos;
-
-  E next() {
-    if (!hasNext()) {
-      throw const NoMoreElementsException();
-    }
-    return _list[_pos++];
-  }
-
-  final List<E> _list;
-  final int _length;  // Cache array length for faster access.
-  int _pos;
-}
-
-class MapBase<K, V> extends DOMType implements Map<K, V> {
-  MapBase();
-
-  bool containsValue(V value) => Maps.containsValue(this, value);
-  bool containsKey(K key) => Maps.containsKey(this, key);
-  V putIfAbsent(K key, V ifAbsent()) => Maps.putIfAbsent(this, key, ifAbsent);
-  clear() => Maps.clear(this);
-  forEach(void f(K key, V value)) => Maps.forEach(this, f);
-  Collection<V> getValues() => Maps.getValues(this);
-  int get length() => Maps.length(this);
-  bool isEmpty() => Maps.isEmpty(this);
-
-  V operator [](K key) {
-    throw 'Must be implemented';
-  }
-
-  operator []=(K key, V value) {
-    throw 'Immutable collection';
-  }
-
-  V remove(K key) {
-    throw 'Immutable collection';
-  }
-
-  Collection<K> getKeys() {
-    throw 'Must be implemented';
-  }
-}