Add supported checks to the SVG library, and library cleanup.

tests/html/svgelement2_test.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 SVGElement2Test;
 import '../../pkg/unittest/lib/unittest.dart';
-import '../../pkg/unittest/lib/html_config.dart';
+import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'svgelement_test.dart' as originalTest;
 
 class A {
   var _this;
   A(x) : this._this = x;
 }
 
 main() {
-  // The svgelement_test requires the field "_this" to map to "_this". In this
-  // test-case we use another library's '_this' first (see issue 3039 and
-  // _ChildNodeListLazy.first).
-  expect(new A(499)._this, 499);
-  originalTest.main();
+  useHtmlIndividualConfiguration();
+
+  group('supported', () {

[blois, 2013/02/01 18:24:19]

This isn't really a supported test- can it be slimmed down or renamed?

+    // The svgelement_test requires the field "_this" to map to "_this". In this
+    // test-case we use another library's '_this' first (see issue 3039 and
+    // _ChildNodeListLazy.first).
+    expect(new A(499)._this, 499);
+    originalTest.main();
+  });
 }