polymer-animation: fix declarative

Author: Yvonne Yip

polymer-animation/polymer-animation-prop.html

@@ -1,5 +1,4 @@
-<link rel="import" href="polymer-animation-keyframe.html">
-<polymer-element name="polymer-animation-prop" attributes="name value">
+<polymer-element name="polymer-animation-prop" attributes="name value" noscript>
   <script>
     /**
      * A CSS property and value to use in a `<polymer-animation-keyframe>`.
@@ -17,6 +16,5 @@
       * @property value
       * @required
       */
-    Polymer('polymer-animation-prop');
   </script>
 </polymer-element>