Fix two type errors and dart2dart status.

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

Index: dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart b/dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart
index 8fd73e5006754e88fd3fd5ab4c3061fb5d41725f..a4254b888979a2adf0da9dcb54bffeda998f4e2f 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/lib/js_mirrors.dart
@@ -402,7 +402,7 @@ class JsClassMirror extends JsObjectMirror implements ClassMirror {
   }
 
   Map<Symbol, Mirror> get members {
-    Map<Symbol, Mirror> result = variables;
+    Map<Symbol, Mirror> result = new Map<Symbol, Mirror>.from(variables);
     for (JsMethodMirror method in _methods) {
       if (method.isSetter) {
         String name = n(method.simpleName);