Reorganize tests for samples so the test is discoverable from the sample

samples/tests/samples/standalone/build_dart_simple_test.dart

Index: samples/tests/samples/standalone/build_dart_simple_test.dart
diff --git a/samples/tests/samples/standalone/build_dart_simple_test.dart b/samples/tests/samples/standalone/build_dart_simple_test.dart
deleted file mode 100644
index 3c6b68a7ef54683b692e2704c8bb891febb4a186..0000000000000000000000000000000000000000
--- a/samples/tests/samples/standalone/build_dart_simple_test.dart
+++ /dev/null
@@ -1,18 +0,0 @@
-// Copyright (c) 2013, 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 build_dart_simple_test;
-
-import '../../../build_dart_simple/build.dart' as build_dart_simple;
-import '../../../build_dart_simple/test.dart' as test1;
-
-// @static-clean
-
-/**
- * This test exists to ensure that the build_dart_simple sample compiles
- * without errors.
- */
-void main() {
-
-}