Cleanup of various DOM dart2js and dart_analyzer warnings

tools/dom/src/TemplateBindings.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of html;
 
 // This code is a port of Model-Driven-Views:
 // https://github.com/polymer-project/mdv
 // The code mostly comes from src/template_element.js
 
@@ skipping 360 matching lines @@
       }
     }
 
     for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
       clone.append(_createDeepCloneAndDecorateTemplates(c, syntax));
     }
     return clone;
   }
 
   // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#dfn-template-contents-owner
-  static Document _getTemplateContentsOwner(Document doc) {
+  static Document _getTemplateContentsOwner(HtmlDocument doc) {
     if (doc.window == null) {
       return doc;
     }
     var d = doc._templateContentsOwner;
     if (d == null) {
       // TODO(arv): This should either be a Document or HTMLDocument depending
       // on doc.
       d = doc.implementation.createHtmlDocument('');
       while (d.$dom_lastChild != null) {
         d.$dom_lastChild.remove();
@@ skipping 57 matching lines @@
     void bootstrap(template) {
       if (!TemplateElement.decorate(template)) {
         _bootstrapTemplatesRecursivelyFrom(template.content);
       }
     }
 
     // Need to do this first as the contents may get lifted if |node| is
     // template.
     // TODO(jmesserly): node is DocumentFragment or Element
     var descendents = (node as dynamic).queryAll(_allTemplatesSelectors);
-    if (node is Element && node.isTemplate) bootstrap(node);
+    if (node is Element && (node as Element).isTemplate) bootstrap(node);
 
     descendents.forEach(bootstrap);
   }
 
   static final String _allTemplatesSelectors = 'template, option[template], ' +
       Element._TABLE_TAGS.keys.map((k) => "$k[template]").join(", ");
 
   static void _addBindings(Node node, model, [CustomBindingSyntax syntax]) {
     if (node is Element) {
       _addAttributeBindings(node, model, syntax);
@@ skipping 133 matching lines @@
 
   static void _removeAllBindingsRecursively(Node node) {
     _nodeOrCustom(node).unbindAll();
     for (var c = node.$dom_firstChild; c != null; c = c.nextNode) {
       _removeAllBindingsRecursively(c);
     }
   }
 
   static void _removeChild(Node parent, Node child) {
     child._templateInstance = null;
-    if (child is Element && child.isTemplate) {
+    if (child is Element && (child as Element).isTemplate) {
       // Make sure we stop observing when we remove an element.
       var templateIterator = child._templateIterator;
       if (templateIterator != null) {
         templateIterator.abandon();
         child._templateIterator = null;
       }
     }
     child.remove();
     _removeAllBindingsRecursively(child);
   }
@@ skipping 155 matching lines @@
     _sub.cancel();
     _sub = null;
   }
 
   void abandon() {
     unobserve();
     _valueBinding.cancel();
     inputs.dispose();
   }
 }