Avoid multiline string literal in svgelement test.

tests/html/svgelement_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 SvgElementTest;
 import 'dart:html';
 import 'dart:svg' as svg;
 import 'package:expect/expect.dart';
 import 'package:unittest/html_individual_config.dart';
 import 'package:unittest/unittest.dart';
@@ skipping 22 matching lines @@
     test(tagName, () {
       expect(isExpectedClass(new svg.SvgElement.tag(tagName)), expectation);
       if (allowsInnerHtml) {
         expect(isExpectedClass(new svg.SvgElement.svg('<$tagName></$tagName>')),
             expectation && allowsInnerHtml);
       }
     });
   }
   group('additionalConstructors', () {
     test('valid', () {
-      final svgContent = """
-<svg version="1.1">
-  <circle></circle>
-  <path></path>
-</svg>""";
+      final svgContent =
+          "<svg version=\"1.1\">\n"
+          "  <circle></circle>\n"
+          "  <path></path>\n"
+          "</svg>";
       final el = new svg.SvgElement.svg(svgContent);
       expect(el, isSvgSvgElement);
       expect(el.innerHtml, anyOf("<circle></circle><path></path>", '<circle '
           'xmlns="http://www.w3.org/2000/svg" /><path '
           'xmlns="http://www.w3.org/2000/svg" />'));
       expect(el.outerHtml, anyOf(svgContent,
           '<svg xmlns="http://www.w3.org/2000/svg" version="1.1">\n  '
-          '<circle />\n  <path />\n</svg>',
-          '<svg xmlns="http://www.w3.org/2000/svg" version="1.1">\r\n  '
-          '<circle />\r\n  <path />\r\n</svg>'));
+          '<circle />\n  <path />\n</svg>'));
     });
 
     test('has no parent', () =>
       expect(new svg.SvgElement.svg('<circle/>').parent, isNull)
     );
 
     test('empty', () {
       expect(() => new svg.SvgElement.svg(""), throwsStateError);
     });
 
@@ skipping 407 matching lines @@
   group('PathElement', () {
     test('pathSegList', () {
       svg.PathElement path =
           new svg.SvgElement.svg('<path d="M 100 100 L 300 100 L 200 300 z"/>');
       for (var seg in path.pathSegList) {
         expect(seg is svg.PathSeg, isTrue);
       }
     });
   });
 }