Reapply "Rename mappedBy to map."

pkg/yaml/lib/yaml.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.
 
 /// A parser for [YAML](http://www.yaml.org/).
 ///
 /// Use [loadYaml] to load a single document, or [loadYamlStream] to load a
 /// stream of documents. For example:
 ///
 ///     import 'package:yaml/yaml.dart';
@@ skipping 42 matching lines @@
 }
 
 /// Loads a stream of documents from a YAML string.
 ///
 /// The return value is mostly normal Dart objects. However, since YAML mappings
 /// support some key types that the default Dart map implementation doesn't
 /// (null, NaN, booleans, lists, and maps), all maps in the returned document
 /// are YamlMaps. These have a few small behavioral differences from the default
 /// Map implementation; for details, see the YamlMap class.
 List loadYamlStream(String yaml) {
-  return new _Parser(yaml).l_yamlStream().mappedBy((doc) =>
-      new _Constructor(new _Composer(doc).compose()).construct())
+  return new _Parser(yaml).l_yamlStream()
+      .map((doc) => new _Constructor(new _Composer(doc).compose()).construct())
       .toList();
 }
 
 /// An error thrown by the YAML processor.
 class YamlException implements Exception {
   String msg;
 
   YamlException(this.msg);
 
   String toString() => msg;
 }