update TemplateBinding and Custom Elements polyfills

pkg/template_binding/lib/src/instance_binding_map.dart

Index: pkg/template_binding/lib/src/instance_binding_map.dart
diff --git a/pkg/template_binding/lib/src/instance_binding_map.dart b/pkg/template_binding/lib/src/instance_binding_map.dart
index 3868343c8aa675007f74fab14687cb4cd3966676..9b1bf6d53221897e5ea75bcca8a76bfbdecaf946 100644
--- a/pkg/template_binding/lib/src/instance_binding_map.dart
+++ b/pkg/template_binding/lib/src/instance_binding_map.dart
@@ -8,21 +8,14 @@ class _InstanceBindingMap {
   final List bindings;
   final List<_InstanceBindingMap> children;
   final Node templateRef;
-  final bool hasSubTemplate;
 
-  _InstanceBindingMap._(this.bindings, this.children, this.templateRef,
-      this.hasSubTemplate);
+  _InstanceBindingMap._(this.bindings, this.children, this.templateRef);
 
   factory _InstanceBindingMap(Node node, BindingDelegate delegate) {
     var bindings = _getBindings(node, delegate);
-
-    bool hasSubTemplate = false;
     Node templateRef = null;
 
-    if (isSemanticTemplate(node)) {
-      templateRef = node;
-      hasSubTemplate = true;
-    }
+    if (isSemanticTemplate(node)) templateRef = node;
 
     List children = null;
     for (var c = node.firstChild, i = 0; c != null; c = c.nextNode, i++) {
@@ -31,13 +24,9 @@ class _InstanceBindingMap {
 
       if (children == null) children = new List(node.nodes.length);
       children[i] = childMap;
-      if (childMap.hasSubTemplate) {
-        hasSubTemplate = true;
-      }
     }
 
-    return new _InstanceBindingMap._(bindings, children, templateRef,
-        hasSubTemplate);
+    return new _InstanceBindingMap._(bindings, children, templateRef);
   }
 }