Gallery: Replace buttons in top toolbar with paper-button and new icons.

ui/file_manager/integration_tests/gallery/slide_mode.js

 // Copyright 2014 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.
 
 'use strict';
 
 /**
  * Runs a test to traverse images in the slide mode.
  *
  * @param {string} testVolumeName Test volume name passed to the addEntries
@@ skipping 60 matching lines @@
  * @return {Promise} Promise to be fulfilled with on success.
  */
 function deleteImage(testVolumeName, volumeType) {
   var launchedPromise = launch(
       testVolumeName, volumeType, [ENTRIES.desktop]);
   var appId;
   return launchedPromise.then(function(args) {
     appId = args.appId;
     return gallery.waitForSlideImage(appId, 800, 600, 'My Desktop Background');
   }).then(function() {
-    return gallery.waitAndClickElement(appId, 'button.delete');
+    return gallery.waitAndClickElement(appId, '.button.delete');
   }).then(function() {
     return gallery.waitAndClickElement(appId, '.cr-dialog-ok');
   }).then(function() {
     return repeatUntil(function() {
       return gallery.getFilesUnderVolume(volumeType, ['New Image Name.png'])
       .then(function(urls) {
         if (urls.length == 0)
           return true;
         return pending('"New Image Name.png" is still there.');
       });
@@ skipping 41 matching lines @@
   return deleteImage('local', 'downloads');
 };
 
 /**
  * The deleteImage test for Google Drive.
  * @return {Promise} Promise to be fulfilled with on success.
  */
 testcase.deleteImageOnDrive = function() {
   return deleteImage('drive', 'drive');
 };