Reapply "Access to imports in the VM's runtime mirrors. Extend test coverage of the source mirrors."

tests/lib/mirrors/library_imports_bad_metadata_test.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // 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.
 
-// Test that classes referenced from a signature of a tear-off closure
-// are emitted.
+library test.library_imports_bad_metadata;
 
-@MirrorsUsed(targets: 'C', symbols: 'A')
+@undefined  /// 01: compile-time error
 import 'dart:mirrors';
-
 import 'package:expect/expect.dart';
 
-class A {}
+main() {
+  LibraryMirror thisLibrary =
+      currentMirrorSystem().findLibrary(#test.library_imports_bad_metadata);
 
-class C {
-  A foo() {}
+  thisLibrary.libraryDependencies.forEach((dep) {
+    Expect.listEquals([], dep.metadata);
+  });
 }
-
-main() {
-  Expect.equals("ClassMirror on 'A'",
-                reflect(new C().foo).function.returnType.toString());
-}