DevTools: move non panel-specific CSS from layerPanel.css to timelinePanel.css

Source/devtools/front_end/timeline/TimelinePanel.js

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2012 Intel 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
@@ skipping 21 matching lines @@
 /**
  * @constructor
  * @extends {WebInspector.Panel}
  * @implements {WebInspector.TimelineModeViewDelegate}
  * @implements {WebInspector.Searchable}
  */
 WebInspector.TimelinePanel = function()
 {
     WebInspector.Panel.call(this, "timeline");
     this.registerRequiredCSS("timelinePanel.css");
-    this.registerRequiredCSS("layersPanel.css");
     this.registerRequiredCSS("filter.css");
     this.element.addEventListener("contextmenu", this._contextMenu.bind(this), false);
 
     this._detailsLinkifier = new WebInspector.Linkifier();
     this._windowStartTime = 0;
     this._windowEndTime = Infinity;
 
     // Create model.
     if (Runtime.experiments.isEnabled("timelineOnTraceEvents")) {
         this._tracingManager = new WebInspector.TracingManager();
@@ skipping 1403 matching lines @@
 
 WebInspector.TimelinePanelFactory.prototype = {
     /**
      * @return {!WebInspector.Panel}
      */
     createPanel: function()
     {
         return WebInspector.TimelinePanel._instance();
     }
 }