Revert "Library functions can never be constructors."

tests/lib/mirrors/redirecting_factory_test.dart

Index: tests/lib/mirrors/redirecting_factory_test.dart
diff --git a/tests/lib/mirrors/redirecting_factory_test.dart b/tests/lib/mirrors/redirecting_factory_test.dart
index 9e46eac06af02b7afab36b3d4b761fa01effa20c..6f0ddf2fbbdf9201a5412d0663ca6b1dddb23e66 100644
--- a/tests/lib/mirrors/redirecting_factory_test.dart
+++ b/tests/lib/mirrors/redirecting_factory_test.dart
@@ -84,15 +84,15 @@ main() {
   Expect.isTrue(instanceMirror.reflectee is Class<String, String>);
   Expect.isTrue(instanceMirror.reflectee is Class<int, String>);
 
-  instanceMirror = classMirror.newInstance(
-      #redirectingFactoryUnnamedOptional, [43]);
-  Expect.equals(1, instanceMirror.reflectee.field);
-
   bool isDart2js = false;
   isDart2js = true; /// 01: ok
   if (isDart2js) return;
 
   instanceMirror = classMirror.newInstance(
+      #redirectingFactoryUnnamedOptional, [43]);
+  Expect.equals(1, instanceMirror.reflectee.field);
+
+  instanceMirror = classMirror.newInstance(
       #redirectingFactoryNamedOptional, [43]);
   Expect.equals(1, instanceMirror.reflectee.field);