unittest step2: bye bye to multiple entrypoints for unittest

samples/tests/samples/src/lib/layout/LayoutTest.dart

 // Copyright (c) 2011, 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('layout_tests');
 
 #import('dart:html');
 #import('../../../../../ui_lib/base/base.dart');
 #import('../../../../../ui_lib/layout/layout.dart');
 #import('../../../../../ui_lib/view/view.dart');
 #import('../../../../../ui_lib/util/utilslib.dart');
-#import('../../../../../../lib/unittest/unittest_html.dart');
+#import('../../../../../../lib/unittest/unittest.dart');
+#import('../../../../../../lib/unittest/html_config.dart');
 
 #source('GridLayoutDemo.dart');
 #source('GridExamples.dart');
 #source('CSS.dart');
 
 // TODO(jmesserly): these tests would be easier to work with if they were WebKit
 // layout tests. The way DumpRenderTree works is exactly what we want for
 // testing layout: run the example and then print the element tree with metrics.
 // The UnitTestSuite wrapper gets in our way here, because you can't "see" the
 // test layout visually when you're debugging.
 // See these links for more info:
 //   http://www.webkit.org/quality/testwriting.html
 //   http://www.w3.org/Style/CSS/Test/guidelines.html
 
 // TODO(jmesserly): need parser unit tests, especially error conditions
 
 /**
  * Tests the grid layout. Currently based on examples from the spec at:
  * [http://dev.w3.org/csswg/css3-grid-align/]
  */
 main() {
+  useHtmlConfiguration();
   addGridStyles('400px', '400px');
 
   asyncTest('Spec Example 1', 1, () {
     verifyExample('1 Adaptive Layouts', {
       'title': [0, 0, 144, 24],
       'score': [0, 376, 144, 24],
       'stats': [0, 24, 144, 24],
       'board': [144, 0, 256, 376],
       'controls': [185, 376, 174, 24],
     });
@@ skipping 135 matching lines @@
       Expect.equals(values[1], offset.top);
       Expect.equals(values[2], offset.width);
       Expect.equals(values[3], offset.height);
     });
   }
 }
 
 verifyExample(String example, [Map expected = null]) {
   usingGrid(example, (grid) => verifyGrid(example, expected));
 }