DevTools: bake generic css files into the concatenated one.

Source/devtools/front_end/ui/SidebarPane.js

 /*
  * Copyright (C) 2007 Apple Inc.  All rights reserved.
  *
  * 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.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 141 matching lines @@
 
 /**
  * @constructor
  * @extends {WebInspector.View}
  */
 WebInspector.SidebarPaneStack = function()
 {
     WebInspector.View.call(this);
     this.setMinimumSize(25, 0);
     this.element.className = "sidebar-pane-stack"; // Override
-    this.registerRequiredCSS("sidebarPane.css");
 }
 
 WebInspector.SidebarPaneStack.prototype = {
     /**
      * @param {!WebInspector.SidebarPane} pane
      */
     addPane: function(pane)
     {
         new WebInspector.SidebarPaneTitle(this.element, pane);
     },
 
     __proto__: WebInspector.View.prototype
 }
 
 /**
  * @constructor
  * @extends {WebInspector.TabbedPane}
  */
 WebInspector.SidebarTabbedPane = function()
 {
     WebInspector.TabbedPane.call(this);
     this.setRetainTabOrder(true);
     this.element.classList.add("sidebar-tabbed-pane");
-    this.registerRequiredCSS("sidebarPane.css");
 }
 
 WebInspector.SidebarTabbedPane.prototype = {
     /**
      * @param {!WebInspector.SidebarPane} pane
      */
     addPane: function(pane)
     {
         var title = pane.title();
         this.appendTab(title, title, pane);
         pane.element.appendChild(pane.titleElement);
         pane.setExpandCallback(this.selectTab.bind(this, title));
 
     },
 
     __proto__: WebInspector.TabbedPane.prototype
 }