Remove unmodifiable map wrappers that could instead use UnmodifiableMapView.

sdk/lib/core/uri.dart

 // Copyright (c) 2012, 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.
 
 part of dart.core;
 
 /**
  * A parsed URI, such as a URL.
  *
  * **See also:**
@@ skipping 708 matching lines @@
    * has been decoded. If there is no query the empty map is returned.
    *
    * Keys in the query string that have no value are mapped to the
    * empty string.
    *
    * The returned map is unmodifiable and will throw [UnsupportedError] on any
    * calls that would mutate it.
    */
   Map<String, String> get queryParameters {
     if (_queryParameters == null) {
-      _queryParameters = new _UnmodifiableMap(splitQueryString(query));
+      _queryParameters = new UnmodifiableMapView(splitQueryString(query));
     }
     return _queryParameters;
   }
 
   static String _makeHost(String host) {
     if (host == null || host.isEmpty) return host;
     if (host.codeUnitAt(0) == _LEFT_BRACKET) {
       if (host.codeUnitAt(host.length - 1) != _RIGHT_BRACKET) {
         throw new FormatException('Missing end `]` to match `[` in host');
       }
@@ skipping 1102 matching lines @@
       0xafff,   // 0x30 - 0x3f  1111111111110101
                 //              @ABCDEFGHIJKLMNO
       0xffff,   // 0x40 - 0x4f  1111111111111111
                 //              PQRSTUVWXYZ    _
       0x87ff,   // 0x50 - 0x5f  1111111111100001
                 //               abcdefghijklmno
       0xfffe,   // 0x60 - 0x6f  0111111111111111
                 //              pqrstuvwxyz   ~
       0x47ff];  // 0x70 - 0x7f  1111111111100010
 }
-
-class _UnmodifiableMap<K, V> implements Map<K, V> {
-  final Map _map;
-  const _UnmodifiableMap(this._map);
-
-  bool containsValue(Object value) => _map.containsValue(value);
-  bool containsKey(Object key) => _map.containsKey(key);
-  V operator [](Object key) => _map[key];
-  void operator []=(K key, V value) {
-    throw new UnsupportedError("Cannot modify an unmodifiable map");
-  }
-  V putIfAbsent(K key, V ifAbsent()) {
-    throw new UnsupportedError("Cannot modify an unmodifiable map");
-  }
-  addAll(Map other) {
-    throw new UnsupportedError("Cannot modify an unmodifiable map");
-  }
-  V remove(Object key) {
-    throw new UnsupportedError("Cannot modify an unmodifiable map");
-  }
-  void clear() {
-    throw new UnsupportedError("Cannot modify an unmodifiable map");
-  }
-  void forEach(void f(K key, V value)) => _map.forEach(f);
-  Iterable<K> get keys => _map.keys;
-  Iterable<V> get values => _map.values;
-  int get length => _map.length;
-  bool get isEmpty => _map.isEmpty;
-  bool get isNotEmpty => _map.isNotEmpty;
-}