DevTools: render category filters in a way that they don't clash.

Source/devtools/front_end/timeline/TimelineUIUtils.js

 /*
  * Copyright (C) 2013 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 1367 matching lines @@
     return WebInspector.TimelineUIUtils.createFillStyle(context, width, height, category.fillColorStop0, category.fillColorStop1, category.borderColor);
 }
 
 /**
  * @param {!WebInspector.TimelineCategory} category
  * @return {string}
  */
 WebInspector.TimelineUIUtils.createStyleRuleForCategory = function(category)
 {
     var selector = ".timeline-category-" + category.name + " .timeline-graph-bar, " +
-        ".panel.timeline .timeline-filters-header .filter-checkbox-filter.filter-checkbox-filter-" + category.name + " .checkbox-filter-checkbox, " +
         ".timeline-details-view .timeline-" + category.name + ", " +
         ".timeline-category-" + category.name + " .timeline-tree-icon";
 
     return selector + " { background-image: linear-gradient(" +
        category.fillColorStop0 + ", " + category.fillColorStop1 + " 25%, " + category.fillColorStop1 + " 25%, " + category.fillColorStop1 + ");" +
        " border-color: " + category.borderColor +
        "}";
 }
 
 /**
@@ skipping 492 matching lines @@
             return;
 
         var stackTraceElement = parentElement.createChild("div", "timeline-details-view-row-value timeline-details-view-row-stack-trace monospace");
 
         var callFrameElem = WebInspector.DOMPresentationUtils.buildStackTracePreviewContents(this._target, this._linkifier, stackTrace);
 
         stackTraceElement.appendChild(callFrameElem);
     }
 
 }