Don't hide interceptors in mirrors.

tests/lib/mirrors/intercepted_class_test.dart

Index: tests/lib/mirrors/intercepted_class_test.dart
diff --git a/tests/lib/mirrors/intercepted_class_test.dart b/tests/lib/mirrors/intercepted_class_test.dart
index 9c820eca37f1d03754e95dcd2c21e93a5ce6e6a7..57a7737478fa607dfea64b3f818bae509754d8a4 100644
--- a/tests/lib/mirrors/intercepted_class_test.dart
+++ b/tests/lib/mirrors/intercepted_class_test.dart
@@ -10,8 +10,7 @@ import 'dart:mirrors';
 
 import 'stringify.dart' show stringify, expect;
 
-checkClassMirror(ClassMirror cls, String name) {
-  expect('s($name)', cls.simpleName);
+checkClassMirrorMethods(ClassMirror cls) {
   var variables = new Map();
   cls.declarations.forEach((Symbol key, DeclarationMirror value) {
     if (value is VariableMirror && !value.isStatic && !value.isPrivate) {
@@ -21,6 +20,11 @@ checkClassMirror(ClassMirror cls, String name) {
   expect('{}', variables);
 }
 
+checkClassMirror(ClassMirror cls, String name) {
+  expect('s($name)', cls.simpleName);
+  checkClassMirrorMethods(cls);
+}
+
 main() {
   checkClassMirror(reflectClass(String), 'String');
   checkClassMirror(reflectClass(int), 'int');