Splitting SVG types out of dart:html.

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 'dart:html';
 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();
 }