MD Settings: convert paper-icon-button to paper-icon-button-light.

chrome/test/data/webui/settings/zoom_levels_tests.js

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 /** @fileoverview Suite of tests for zoom-levels. */
 suite('ZoomLevels', function() {
   /**
    * A zoom levels category created before each test.
    * @type {ZoomLevels}
    */
@@ skipping 48 matching lines @@
     return browserProxy.whenCalled('fetchZoomLevels');
   }
 
   /**
    * Fetch the remove button from the list.
    * @param {!HTMLElement} listContainer The list to use for the lookup.
    * @param {number} index The index of the child element (which site) to
    *     fetch.
    */
   function getRemoveButton(listContainer, index) {
-    return listContainer.children[index].querySelector('paper-icon-button');
+    return listContainer.children[index].querySelector('button');
   }
 
   test('empty zoom state', function() {
     var list = testElement.$.list;
     assertTrue(!!list);
     assertEquals(0, list.items.length);
     assertEquals(
         0, testElement.shadowRoot.querySelectorAll('.list-item').length);
     assertTrue(!!testElement.$$('#empty'));
   });
@@ skipping 13 matching lines @@
           var removeButton = getRemoveButton(testElement.$.listContainer, 0);
           assert(!!removeButton);
           MockInteractions.tap(removeButton);
           return browserProxy.whenCalled('removeZoomLevel');
         })
         .then(function(args) {
           assertEquals('http://www.google.com', args[0]);
         });
   });
 });