Fix path browser test.

pkg/path/test/browser_test.dart

Index: pkg/path/test/browser_test.dart
diff --git a/pkg/path/test/browser_test.dart b/pkg/path/test/browser_test.dart
index 3e885007caca4b6fbb878e2ffa6e255580c4bbf7..072564697dc63c7bc482be9cebd7bf7440f24ed5 100644
--- a/pkg/path/test/browser_test.dart
+++ b/pkg/path/test/browser_test.dart
@@ -12,9 +12,9 @@ main() {
   useHtmlConfiguration();
 
   group('new Builder()', () {
-    test('uses the current directory if root and style are omitted', () {
+    test('uses the window location if root and style are omitted', () {
       var builder = new path.Builder();
-      expect(builder.root, io.Directory.current.path);
+      expect(builder.root, window.location.href);
     });
 
     test('uses "." if root is omitted', () {