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

tests/lib/mirrors/library_imports_prefixed_test.dart

Index: tests/lib/mirrors/library_imports_prefixed_test.dart
diff --git a/tests/lib/mirrors/library_imports_prefixed_test.dart b/tests/lib/mirrors/library_imports_prefixed_test.dart
deleted file mode 100644
index beda171496910cae43b84a9a3a28809f5d86447b..0000000000000000000000000000000000000000
--- a/tests/lib/mirrors/library_imports_prefixed_test.dart
+++ /dev/null
@@ -1,31 +0,0 @@
-// 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.
-
-library test.library_imports;
-
-import 'dart:mirrors';
-import 'package:expect/expect.dart';
-import 'stringify.dart';
-
-import 'library_imports_prefixed.dart';
-
-test(MirrorSystem mirrors) {
-  LibraryMirror prefixed = mirrors.findLibrary(#library_imports_prefixed);
-  LibraryMirror a = mirrors.findLibrary(#library_imports_a);
-  LibraryMirror b = mirrors.findLibrary(#library_imports_b);
-  LibraryMirror core = mirrors.findLibrary(#dart.core);
-
-  Expect.setEquals([a, b, core],
-                   prefixed.libraryDependencies.map((dep) => dep.targetLibrary));
-
-  Expect.stringEquals(
-      'import dart.core\n'
-      'import library_imports_a as prefixa\n'
-      'import library_imports_b as prefixb\n',
-      stringifyDependencies(prefixed));
-}
-
-main() {
-  test(currentMirrorSystem());
-}