Adjustments to next Chrome roll.

tests/html/shadowroot_test.dart

Index: tests/html/shadowroot_test.dart
diff --git a/tests/html/shadowroot_test.dart b/tests/html/shadowroot_test.dart
index 4fb6fa08d4b78ec78ab11153c575215653607e91..1b027c6d1929d16f37ab3cfc48207f25f200f1d6 100644
--- a/tests/html/shadowroot_test.dart
+++ b/tests/html/shadowroot_test.dart
@@ -18,10 +18,10 @@ main() {
 
     // If it's supported, then it should work. Otherwise should fail.
     if (isSupported) {
-      var shadowRoot = new ShadowRoot(new DivElement());
+      var shadowRoot = new DivElement().webkitCreateShadowRoot();
       expect(shadowRoot, isShadowRoot);
     } else {
-      expect(() => new ShadowRoot(new DivElement()), throws);
+      expect(() => new DivElement().webkitCreateShadowRoot(), throws);
     }
   });
 }