Format all dart: library files

sdk/lib/_internal/js_runtime/lib/constant_map.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 _js_helper;
 
-class ConstantMapView<K, V> extends UnmodifiableMapView
-                      implements ConstantMap {
+class ConstantMapView<K, V> extends UnmodifiableMapView implements ConstantMap {
   ConstantMapView(Map base) : super(base);
 }
 
 abstract class ConstantMap<K, V> implements Map<K, V> {
   // Used to create unmodifiable maps from other maps.
   factory ConstantMap.from(Map other) {
     List keys = other.keys.toList();
     bool allStrings = true;
     for (var k in keys) {
       if (k is! String) {
@@ skipping 30 matching lines @@
 
   bool get isEmpty => length == 0;
 
   bool get isNotEmpty => !isEmpty;
 
   String toString() => Maps.mapToString(this);
 
   static _throwUnmodifiable() {
     throw new UnsupportedError("Cannot modify unmodifiable Map");
   }
+
   void operator []=(K key, V val) => _throwUnmodifiable();
   V putIfAbsent(K key, V ifAbsent()) => _throwUnmodifiable();
   V remove(K key) => _throwUnmodifiable();
   void clear() => _throwUnmodifiable();
   void addAll(Map<K, V> other) => _throwUnmodifiable();
 }
 
 class ConstantStringMap<K, V> extends ConstantMap<K, V> {
-
   // This constructor is not used for actual compile-time constants.
   // The instantiation of constant maps is shortcut by the compiler.
   const ConstantStringMap._(this._length, this._jsObject, this._keys)
       : super._();
 
   // TODO(18131): Ensure type inference knows the precise types of the fields.
   final int _length;
   // A constant map is backed by a JavaScript object.
   final _jsObject;
   final List<K> _keys;
@@ skipping 105 matching lines @@
   Iterable<K> get keys {
     return _getMap().keys;
   }
 
   Iterable<V> get values {
     return _getMap().values;
   }
 
   int get length => _getMap().length;
 }