DevTools: Fix style of "Show all nodes" button

Source/devtools/front_end/elements/ElementsTreeOutline.js

 /*
  * Copyright (C) 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Matt Lilek <webkit@mattlilek.com>
  * Copyright (C) 2009 Joseph Pecoraro
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
@@ skipping 1338 matching lines @@
 
         // In case some nodes from the expanded range were removed, pull some nodes from the collapsed range into the expanded range at the bottom.
         for (var i = this.expandedChildCount, limit = Math.min(this.expandedChildrenLimit, childNodeCount); i < limit; ++i)
             this.insertChildElement(visibleChildren[i], i);
 
         const expandedChildCount = this.expandedChildCount;
         if (childNodeCount > this.expandedChildCount) {
             var targetButtonIndex = expandedChildCount;
             if (!this.expandAllButtonElement) {
                 var button = document.createElement("button");
-                button.className = "show-all-nodes";
+                button.className = "text-button";
                 button.value = "";
                 var item = new TreeElement(button, null, false);
                 item.selectable = false;
                 item.expandAllButton = true;
                 this.insertChild(item, targetButtonIndex);
                 this.expandAllButtonElement = item.listItemElement.firstChild;
                 this.expandAllButtonElement.__treeElement = item;
                 this.expandAllButtonElement.addEventListener("click", this.handleLoadAllChildren.bind(this), false);
             } else if (!this.expandAllButtonElement.__treeElement.parent)
                 this.insertChild(this.expandAllButtonElement.__treeElement, targetButtonIndex);
@@ skipping 1465 matching lines @@
         var treeOutline = new WebInspector.ElementsTreeOutline(node.target(), false, false);
         treeOutline.rootDOMNode = node;
         treeOutline.element.classList.add("outline-disclosure");
         if (!treeOutline.children[0].hasChildren)
             treeOutline.element.classList.add("single-node");
         treeOutline.setVisible(true);
         treeOutline.element.treeElementForTest = treeOutline.children[0];
         return treeOutline.element;
     }
 }