Revert "Add support for source maps in deferred libraries."

tests/compiler/dart2js/source_map_deferred_validator_test_file.dart

Index: tests/compiler/dart2js/source_map_deferred_validator_test_file.dart
diff --git a/tests/compiler/dart2js/source_map_deferred_validator_test_file.dart b/tests/compiler/dart2js/source_map_deferred_validator_test_file.dart
deleted file mode 100644
index 08ae57f57163543d59d72130fb48ceba1ffde023..0000000000000000000000000000000000000000
--- a/tests/compiler/dart2js/source_map_deferred_validator_test_file.dart
+++ /dev/null
@@ -1,14 +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.
-
-import 'source_map_deferred_validator_test_lib.dart' deferred as def;
-
-void main() {
-  def.loadLibrary().then((_) {
-    () {
-      var helloClass = new def.HelloClass();
-      helloClass.printHello();
-    }();
-  });
-}