Unrestrict version of PolymerElements/iron-list and update it

chrome/browser/resources/md_downloads/vulcanized.html

Index: chrome/browser/resources/md_downloads/vulcanized.html
diff --git a/chrome/browser/resources/md_downloads/vulcanized.html b/chrome/browser/resources/md_downloads/vulcanized.html
index 85123ff1a165d14a2d1f72988b14e115df63962b..1aa9e4e67f6b8cb20095e43a38df8054dc165e2b 100644
--- a/chrome/browser/resources/md_downloads/vulcanized.html
+++ b/chrome/browser/resources/md_downloads/vulcanized.html
@@ -8,6 +8,14 @@ Code distributed by Google as part of the polymer project is also
 subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
 --><!--
 @license
+Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
+This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
+The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
+The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
+Code distributed by Google as part of the polymer project is also
+subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
+--><!--
+@license
 Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
 This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
 The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
@@ -1032,14 +1040,13 @@ subject to an additional IP rights grant found at http://polymer.github.io/PATEN
     <style>
       :host {
         display: block;
+        position: relative;
       }
 
-      :host(.has-scroller) {
-        overflow: auto;
-      }
-
-      :host(:not(.has-scroller)) {
-        position: relative;
+      @media only screen and (-webkit-max-device-pixel-ratio: 1) {
+        :host {
+          will-change: transform;
+        }
       }
 
       #items {