Deprecate LinkedList.

sdk/lib/collection/linked_list.dart

Index: sdk/lib/collection/linked_list.dart
diff --git a/sdk/lib/collection/linked_list.dart b/sdk/lib/collection/linked_list.dart
index 8ddc05ae6811376f652354702ea813609183e327..41ff14f8c477fbe4be95ea4a379cc9061a15b365 100644
--- a/sdk/lib/collection/linked_list.dart
+++ b/sdk/lib/collection/linked_list.dart
@@ -7,6 +7,9 @@ part of "collection.dart";
 /**
  * A specialized double-linked list of elements that extends [LinkedListEntry].
  *
+ * Deprecated. Use the same named class from package `collection`, instead.
+ * [https://pub.dartlang.org/packages/collection]
+ *
  * This is not a generic data structure. It only accepts elements that extend
  * the [LinkedListEntry] class. See the [Queue] implementations for
  * generic collections that allow constant time adding and removing at the ends.
@@ -27,6 +30,7 @@ part of "collection.dart";
  * A `LinkedList` also allows constant time adding and removing at either end,
  * and a constant time length getter.
  */
+@deprecated
 class LinkedList<E extends LinkedListEntry<E>> extends Iterable<E> {
   int _modificationCount = 0;
   int _length = 0;
@@ -217,6 +221,9 @@ class _LinkedListIterator<E extends LinkedListEntry<E>> implements Iterator<E> {
 /**
  * An object that can be an element in a [LinkedList].
  *
+ * Deprecated. Use the same named class from package `collection`, instead.
+ * [https://pub.dartlang.org/packages/collection]
+ *
  * All elements of a `LinkedList` must extend this class.
  * The class provides the internal links that link elements together
  * in the `LinkedList`, and a reference to the linked list itself
@@ -228,6 +235,7 @@ class _LinkedListIterator<E extends LinkedListEntry<E>> implements Iterator<E> {
  *
  * When created, an entry is not in any linked list.
  */
+@deprecated
 abstract class LinkedListEntry<E extends LinkedListEntry<E>> {
   LinkedList<E> _list;
   E _next;