Update Polymer components.

third_party/polymer/components/iron-iconset-svg/iron-iconset-svg.html

 <!--
 @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
 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
 -->
 
@@ skipping 209 matching lines @@
             svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg'),
             viewBox = content.getAttribute('viewBox') || '0 0 ' + size + ' ' + size,
             cssText = 'pointer-events: none; display: block; width: 100%; height: 100%;';
 
         if (mirrorAllowed && content.hasAttribute('mirror-in-rtl')) {
           cssText += '-webkit-transform:scale(-1,1);transform:scale(-1,1);';
         }
 
         svg.setAttribute('viewBox', viewBox);
         svg.setAttribute('preserveAspectRatio', 'xMidYMid meet');
+        svg.setAttribute('focusable', 'false');
         // TODO(dfreedm): `pointer-events: none` works around https://crbug.com/370136
         // TODO(sjmiles): inline style may not be ideal, but avoids requiring a shadow-root
         svg.style.cssText = cssText;
         svg.appendChild(content).removeAttribute('id');
         return svg;
       }
       return null;
     }
 
   });
 
 </script>