Revert "Rename mappedBy to map."

sdk/lib/core/list.dart

Index: sdk/lib/core/list.dart
diff --git a/sdk/lib/core/list.dart b/sdk/lib/core/list.dart
index 10ba3e054fc25864cae93e793d8731a9376c1b99..114b4db918f591a4927c4fe6a6a24e216a87180f 100644
--- a/sdk/lib/core/list.dart
+++ b/sdk/lib/core/list.dart
@@ -190,4 +190,36 @@ abstract class List<E> implements Collection<E> {
    * [start] is greater than the length of the list.
    */
   void insertRange(int start, int length, [E fill]);
+
+  /**
+   * Returns a lazy unmodifiable [List] where each element [:e:] of [:this:] is
+   * replaced by the result of [:f(e):].
+   *
+   * This method returns a view of the mapped elements. As long as the
+   * returned [List] is not indexed or iterated over, the supplied function [f]
+   * will not be invoked. The transformed elements will not be cached. Accessing
+   * elements multiple times will invoke the supplied function [f] multiple
+   * times.
+   */
+  List mappedBy(f(E element));
+
+  /**
+   * Returns an unmodifiable [List] that hides the first [n] elements.
+   *
+   * The returned list is a view backed by [:this:].
+   *
+   * While [:this:] has fewer than [n] elements, then the resulting [List]
+   * will be empty.
+   */
+  List<E> skip(int n);
+
+  /**
+   * Returns an unmodifiable [List] with at most [n] elements.
+   *
+   * The returned list is a view backed by this.
+   *
+   * The returned [List] may contain fewer than [n] elements, while [:this:]
+   * contains fewer than [n] elements.
+   */
+  List<E> take(int n);
 }