Changed LinkedHashSet to Set and LinkedHashMap to Map.

sdk/lib/_internal/compiler/implementation/enqueue.dart

Index: sdk/lib/_internal/compiler/implementation/enqueue.dart
diff --git a/sdk/lib/_internal/compiler/implementation/enqueue.dart b/sdk/lib/_internal/compiler/implementation/enqueue.dart
index e489fb187294d571ad7d413a97c685b2ec130e64..c34705ed2903a9c14affbb0644b0c544413da861 100644
--- a/sdk/lib/_internal/compiler/implementation/enqueue.dart
+++ b/sdk/lib/_internal/compiler/implementation/enqueue.dart
@@ -578,7 +578,7 @@ class ResolutionEnqueuer extends Enqueuer {
   ResolutionEnqueuer(Compiler compiler,
                      ItemCompilationContext itemCompilationContextCreator())
       : super('resolution enqueuer', compiler, itemCompilationContextCreator),
-        resolvedElements = new LinkedHashMap<Element, TreeElements>(),
+        resolvedElements = new Map<Element, TreeElements>(),
         queue = new Queue<ResolutionWorkItem>(),
         postQueue = new Queue<PostProcessTask>();