Eliminate old style import from language tests

tests/language/library_private_in_constructor_test.dart

Index: tests/language/library_private_in_constructor_test.dart
===================================================================
--- tests/language/library_private_in_constructor_test.dart	(revision 15598)
+++ tests/language/library_private_in_constructor_test.dart	(working copy)
@@ -2,9 +2,9 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-#library('LibraryPrivateInConstructor');
-#import("library_private_in_constructor_a.dart");
-#import("library_private_in_constructor_b.dart");
+library LibraryPrivateInConstructor;
+import "library_private_in_constructor_a.dart";
+import "library_private_in_constructor_b.dart";
 
 main() {
   var b = new B();