Only allow one shadowRoot.

sky/engine/web/tests/data/touch-action-tests.js

Index: sky/engine/web/tests/data/touch-action-tests.js
diff --git a/sky/engine/web/tests/data/touch-action-tests.js b/sky/engine/web/tests/data/touch-action-tests.js
index 82265d5b91de17671d5a0ad981e6d5da234fe131..7eff011db1f1e49f20b0ddb5a45c4acc4239a0f9 100644
--- a/sky/engine/web/tests/data/touch-action-tests.js
+++ b/sky/engine/web/tests/data/touch-action-tests.js
@@ -4,7 +4,7 @@ document.addEventListener('touchstart', function() {});
 window.addEventListener('load', function() {
   // Create any shadow DOM nodes requested by the test.
   var shadowTrees = document.querySelectorAll('[make-shadow-dom]');
-  if (shadowTrees.length > 0 && !HTMLElement.prototype.createShadowRoot) {
+  if (shadowTrees.length > 0 && !HTMLElement.prototype.ensureShadowRoot) {
     document.body.innerHTML = 'ERROR: Shadow DOM not supported!';
     return;
   }
@@ -16,7 +16,7 @@ window.addEventListener('load', function() {
       return;
     }
     tree.parentElement.removeChild(tree);
-    var shadowRoot = host.createShadowRoot();
+    var shadowRoot = host.ensureShadowRoot();
     shadowRoot.appendChild(tree);
   }
 });