Fix border-left measurement for IE.

tests/html/cssstyledeclaration_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 CssStyleDeclarationTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:html';
 import 'dart:async';
 
@@ skipping 90 matching lines @@
   test('css multi get', () {
     var listElement = new Element.html('<ul class="foo">'
         '<li class="bar" style="background-color: red; border-left: 10px;">'
         '<li class="baz" style="background-color: black;>'
         '<li class="baz classy" style="background-color: blue; ">'
         '</ul>');
     document.documentElement.children.add(listElement);
 
     var elements = document.queryAll('li');
     expect(elements.style.backgroundColor, equals('red'));
-    expect(elements.style.borderLeft, equals('10px'));
+    expect(elements.style.borderLeftWidth, equals('10px'));
     elements = document.queryAll('.baz');
     expect(elements.style.backgroundColor, equals('black'));
-    expect(elements.style.borderLeft, equals(''));
+    expect(elements.style.borderLeftWidth, equals(''));
     elements = document.queryAll('.bar');
     expect(elements.style.backgroundColor, equals('red'));
   });
 
   test('css multi set', () {
     var listElement = new Element.html('<ul class="foo">'
         '<li class="bar" style="background-color: red; border-left: 10px;">'
         '<li class="baz" style="background-color: black;>'
         '<li class="baz" id="wat" style="background-color: blue; ">'
         '</ul>');
     document.documentElement.children.add(listElement);
 
     var elements = document.queryAll('li');
     elements.style.backgroundColor = 'green';
     expect(elements.style.backgroundColor, equals('green'));
-    expect(elements.style.borderLeft, equals('10px'));
+    expect(elements.style.borderLeftWidth, equals('10px'));
 
     elements = document.queryAll('.baz');
     expect(elements.style.backgroundColor, equals('green'));
     elements.style.backgroundColor = 'yellow';
     expect(elements.style.backgroundColor, equals('yellow'));
-    expect(elements.style.borderLeft, equals(''));
+    expect(elements.style.borderLeftWidth, equals(''));
 
     elements = document.queryAll('.bar');
     expect(elements.style.backgroundColor, equals('green'));
     elements = document.queryAll('#wat');
     expect(elements.style.backgroundColor, equals('yellow'));
 
-    elements.style.borderLeft = '18px';
-    expect(elements.style.borderLeft, equals('18px'));
+    elements.style.borderLeftWidth = '18px';
+    expect(elements.style.borderLeftWidth, equals('18px'));
     elements = document.queryAll('li');
-    expect(elements.style.borderLeft, equals('10px'));
+    expect(elements.style.borderLeftWidth, equals('10px'));
   });
 }