DevTools: Use View.registerRequiredCSS() in View-based web components

Source/devtools/front_end/elements/ElementsBreadcrumbs.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.
 
 /**
  * @constructor
  * @extends {WebInspector.HBox}
  */
 WebInspector.ElementsBreadcrumbs = function()
 {
     WebInspector.HBox.call(this, true);
-    this.contentElement.appendChild(WebInspector.View.createStyleElement("elements/breadcrumbs.css"));
+    this.registerRequiredCSS("elements/breadcrumbs.css");
 
     this.crumbsElement = this.contentElement.createChild("div", "crumbs");
     this.crumbsElement.addEventListener("mousemove", this._mouseMovedInCrumbs.bind(this), false);
     this.crumbsElement.addEventListener("mouseleave", this._mouseMovedOutOfCrumbs.bind(this), false);
 }
 
 /** @enum {string} */
 WebInspector.ElementsBreadcrumbs.Events = {
     NodeSelected: "NodeSelected"
 }
@@ skipping 402 matching lines @@
         compact(selectedCrumb);
         if (crumbsAreSmallerThanContainer())
             return;
 
         // Collapse the selected crumb as a last resort. Pass true to prevent coalescing.
         collapse(selectedCrumb, true);
     },
 
     __proto__: WebInspector.HBox.prototype
 }