DevTools: remove padding before pseudo-element matched styles.

Source/devtools/front_end/elements/StylesSidebarPane.js

Index: Source/devtools/front_end/elements/StylesSidebarPane.js
diff --git a/Source/devtools/front_end/elements/StylesSidebarPane.js b/Source/devtools/front_end/elements/StylesSidebarPane.js
index 2be77f499c78d5d47b0c5ccb7183fa181b4de590..1af04b2c1d6da6b4760921f545ab0acade2613ad 100644
--- a/Source/devtools/front_end/elements/StylesSidebarPane.js
+++ b/Source/devtools/front_end/elements/StylesSidebarPane.js
@@ -454,9 +454,6 @@ WebInspector.StylesSidebarPane.prototype = {
             this._sectionBlocks.push(block);
         }
 
-        if (!!node.pseudoType())
-            this._appendTopPadding();
-
         for (var block of this._sectionBlocks) {
             var titleElement = block.titleElement();
             if (titleElement)
@@ -558,13 +555,6 @@ WebInspector.StylesSidebarPane.prototype = {
         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>}