Changed LinkedHashSet to Set and LinkedHashMap to Map.

sdk/lib/_internal/compiler/implementation/util/expensive_set.dart

Index: sdk/lib/_internal/compiler/implementation/util/expensive_set.dart
diff --git a/sdk/lib/_internal/compiler/implementation/util/expensive_set.dart b/sdk/lib/_internal/compiler/implementation/util/expensive_set.dart
index e506fa1820bd68e78aa44f9da4254e818c4a4ffa..4fb39498cf5cb9a311ff56ac3b19d811c61b2105 100644
--- a/sdk/lib/_internal/compiler/implementation/util/expensive_set.dart
+++ b/sdk/lib/_internal/compiler/implementation/util/expensive_set.dart
@@ -9,14 +9,14 @@ part of dart2js.util;
  * excessive memory usage due to large sets. It acts as an ordinary
  * hash set, but it uses 10 times more memory (by default).
  */
-class ExpensiveSet<E> extends IterableBase<E> implements LinkedHashSet<E> {
+class ExpensiveSet<E> extends IterableBase<E> implements Set<E> {
 
   final List _sets;
 
   ExpensiveSet([int copies = 10]) : _sets = new List(copies) {
     assert(copies > 0);
     for (int i = 0; i < _sets.length; i++) {
-      _sets[i] = new LinkedHashSet<E>();
+      _sets[i] = new Set<E>();
     }
   }