Remove DOMImplementation.

sky/framework/sky-element/TemplateBinding.sky

 <!--
 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 -->
 <import src="observe.sky" as="observe" />
 
 <script>
 Node.prototype.bind = function(name, observable, oneTime) {
   var self = this;
@@ skipping 119 matching lines @@
   Object.getOwnPropertyNames(from).forEach(function(name) {
     Object.defineProperty(to, name,
                           Object.getOwnPropertyDescriptor(from, name));
   });
 }
 
 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_;
     }
 
     template.stagingDocument_ = owner.stagingDocument_;
   }
 
   return template.stagingDocument_;
 }
 
@@ skipping 844 matching lines @@
       this.closeInstanceBindings(this.instances[i]);
     }
 
     this.instances.length = 0;
     this.closeDeps();
     this.templateElement_.iterator_ = undefined;
     this.closed = true;
   }
 };
 </script>