Clear input.value attribute before removing for IE. Fixes #1491. Fixes #1578.

test/unit/bind-elements.html

@@ -25,6 +25,7 @@
     <span id="boundText">{{text}}</span>
     <span idtest id="{{boundId}}"></span>
     <s id="computedContent">{{computeFromTrickyLiterals(3, 'tricky\,\'zot\'')}}</s>
+    <input id="boundInput" value="{{text::input}}">
 </template>
 <script>
   Polymer({