Remove DOMImplementation.

sky/framework/sky-element/TemplateBinding.sky

Index: sky/framework/sky-element/TemplateBinding.sky
diff --git a/sky/framework/sky-element/TemplateBinding.sky b/sky/framework/sky-element/TemplateBinding.sky
index e678f705825e7b377a1c417cbb502873b0ea4fd9..7f0a9041e3f06ad88c7f845b522ef06c6ba028e7 100644
--- a/sky/framework/sky-element/TemplateBinding.sky
+++ b/sky/framework/sky-element/TemplateBinding.sky
@@ -137,7 +137,9 @@ function getTemplateStagingDocument(template) {
   if (!template.stagingDocument_) {
     var owner = template.ownerDocument;
     if (!owner.stagingDocument_) {
-      owner.stagingDocument_ = owner.implementation.createDocument('');
+      // FIXME(sky): Does this need to create a Document without a registration
+      // context?
+      owner.stagingDocument_ = new Document();
       owner.stagingDocument_.isStagingDocument = true;
       owner.stagingDocument_.stagingDocument_ = owner.stagingDocument_;
     }