Site Settings Desktop: In the Zoom category, use cross icon instead of trashcan.

chrome/browser/resources/settings/site_settings/zoom_levels.html

 <link rel="import" href="chrome://resources/html/polymer.html">
 <link rel="import" href="chrome://resources/cr_elements/icons.html">
 <link rel="import" href="chrome://resources/polymer/v1_0/paper-icon-button/paper-icon-button.html">
 <link rel="import" href="chrome://resources/html/web_ui_listener_behavior.html">
 <link rel="import" href="/i18n_setup.html">
 <link rel="import" href="/settings_shared_css.html">
 <link rel="import" href="/site_settings/site_settings_behavior.html">
 <link rel="import" href="/site_settings/site_settings_prefs_browser_proxy.html">
 
 <dom-module id="zoom-levels">
@@ skipping 12 matching lines @@
           rendered-item-count="{{renderedCount}}">
         <div class="list-item">
           <div class="favicon-image"
               style$="[[computeSiteIcon(item.origin)]]">
           </div>
           <div class="middle">
             <div>[[item.origin]]</div>
           </div>
           <div>[[item.zoom]]</div>
           <div>
-            <paper-icon-button icon="settings:delete"
+            <paper-icon-button icon="settings:clear"

[Dan Beam, 2016/09/09 16:36:50]

cr:clear

                 on-tap="removeZoomLevel_">
           </div>
         </div>
       </template>
       <template is="dom-if" if="{{!renderedCount}}">
         <div class="empty-message" id="empty">
           $i18n{siteSettingsNoZoomedSites}
         </div>
       </template>
     </div>
   </template>
   <script src="zoom_levels.js"></script>
 </dom-module>