DevTools: convert a few more icons to UI.Icon.

third_party/WebKit/Source/devtools/front_end/network/BlockedURLsPane.js

 // Copyright (c) 2015 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.
 /**
  * @unrestricted
  */
 Network.BlockedURLsPane = class extends UI.VBox {
   constructor() {
     super(true);
     this.registerRequiredCSS('network/blockedURLsPane.css');
@@ skipping 182 matching lines @@
 
     var label = element.createChild('div', 'blocked-url-text');
     label.textContent = url;
 
     var count = this._blockedRequestsCount(url);
     var countElement = element.createChild('div', 'blocked-count monospace');
     countElement.textContent = String.sprintf('[%d]', count);
     countElement.title = Common.UIString(
         count === 1 ? '%d request blocked by this pattern' : '%d requests blocked by this pattern', count);
 
-    var removeButton = element.createChild('div', 'remove-button');
+    var removeButton = UI.Icon.create('smallicon-cross', 'remove-icon');
+    element.appendChild(removeButton);
     removeButton.title = Common.UIString('Remove');
     removeButton.addEventListener('click', this._removeBlockedURL.bind(this, index), false);
 
     element.addEventListener('contextmenu', this._contextMenu.bind(this, index), true);
     element.addEventListener(
         'dblclick', this._edit.bind(this, url, element, this._changeBlockedURL.bind(this, index)), false);
     return element;
   }
 
   /**
@@ skipping 62 matching lines @@
    * @override
    * @param {!UI.Context} context
    * @param {string} actionId
    * @return {boolean}
    */
   handleAction(context, actionId) {
     UI.viewManager.showView('network.blocked-urls');
     return true;
   }
 };