Fixing status of register test on IE

pkg/polymer/lib/src/declaration.dart

Index: pkg/polymer/lib/src/declaration.dart
diff --git a/pkg/polymer/lib/src/declaration.dart b/pkg/polymer/lib/src/declaration.dart
index 7e6be8220decb54022c31c5223e16437a567cd80..07c0dc4074e7d72c3ea424f4193585c3611ae143 100644
--- a/pkg/polymer/lib/src/declaration.dart
+++ b/pkg/polymer/lib/src/declaration.dart
@@ -241,9 +241,7 @@ class PolymerDeclaration extends HtmlElement {
       baseTag = decl.attributes['extends'];
       decl = decl.superDeclaration;
     }
-    // native element must be specified in extends
-    var nativeExtends = baseTag;
-    document.register(name, type, extendsTag: nativeExtends);
+    document.register(name, type, extendsTag: baseTag);
   }
 
   void publishAttributes(ClassMirror cls, PolymerDeclaration superDecl) {