Remove pixel/layout tests in tests/utils + special casing in the testing scripts for pixel/layout t…

tests/utils/txt_layout_test.dart

Index: tests/utils/txt_layout_test.dart
diff --git a/tests/utils/txt_layout_test.dart b/tests/utils/txt_layout_test.dart
deleted file mode 100644
index 6ec9d90a1caf2e6896f0edd8221b4f54f9e45d56..0000000000000000000000000000000000000000
--- a/tests/utils/txt_layout_test.dart
+++ /dev/null
@@ -1,28 +0,0 @@
-// Copyright (c) 2012, 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.
-
-/**
- * Tests the layout test functionality of test.dart. There is a .txt image with
- * the same name as this file. The existence of the .txt file indicates to the
- * test framework that we want to compare the final state of this application
- * against a text file (with a text representation of the DOM tree).
- */
-library layouttest;
-
-import 'dart:html';
-
-main() {
-  var div1Style = _style('blue', 20, 10, 40, 10);
-  var div2Style = _style('red', 25, 30, 40, 10);
-  var div1 = new Element.html('<div style="$div1Style"></div>');
-  var div2 = new Element.html('<div style="$div2Style"></div>');
-  document.body.children.add(div1);
-  document.body.children.add(div2);
-}
-
-_style(String color, int top, int left, int width, int height) {
-  return ('background-color:$color; position:absolute; '
-          'top:${top}px; left:${left}px; '
-          'width:${width}px; height:${height}px;');
-}