DevTools: remove padding before pseudo-element matched styles.

Source/devtools/front_end/elements/StylesSidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  * 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
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 436 matching lines @@
         for (var pseudoId of pseudoIds) {
             var block = WebInspector.SectionBlock.createPseudoIdBlock(pseudoId);
             var cascade = cascades.pseudo.get(pseudoId);
             for (var sectionModel of cascade.sectionModels()) {
                 var section = new WebInspector.StylePropertiesSection(this, sectionModel);
                 block.sections.push(section);
             }
             this._sectionBlocks.push(block);
         }
 
-        if (!!node.pseudoType())
-            this._appendTopPadding();
-
         for (var block of this._sectionBlocks) {
             var titleElement = block.titleElement();
             if (titleElement)
                 this._sectionsContainer.appendChild(titleElement);
             for (var section of block.sections)
                 this._sectionsContainer.appendChild(section.element);
         }
 
         if (this._filterRegex)
             this._updateFilter();
@@ skipping 81 matching lines @@
                 var rulePayload = parentStyles.matchedCSSRules[i];
                 if (!this._containsInherited(rulePayload.style))
                     continue;
                 cascade.appendModelFromRule(rulePayload, parentNode);
             }
             parentNode = parentNode.parentNode;
         }
         return cascade;
     },
 
-    _appendTopPadding: function()
-    {
-        var separatorElement = createElement("div");
-        separatorElement.className = "styles-sidebar-placeholder";
-        this._sectionsContainer.appendChild(separatorElement);
-    },
-
     /**
      * @param {!WebInspector.SectionCascade} matchedCascade
      * @return {!Array.<!WebInspector.SectionBlock>}
      */
     _rebuildSectionsForMatchedStyleRules: function(matchedCascade)
     {
         var blocks = [new WebInspector.SectionBlock(null)];
         var lastParentNode = null;
         for (var sectionModel of matchedCascade.sectionModels()) {
             var parentNode = sectionModel.parentNode();
@@ skipping 2557 matching lines @@
 
     /**
      * @override
      * @return {?WebInspector.ToolbarItem}
      */
     item: function()
     {
         return this._button;
     }
 }