DevTools: remove old Timeline front-end implementation

Source/devtools/front_end/main/Main.js

 /*
  * Copyright (C) 2006, 2007, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2007 Matt Lilek (pewtermoose@gmail.com).
  * 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
@@ skipping 138 matching lines @@
         Runtime.experiments.register("applyCustomStylesheet", "Allow custom UI themes");
         Runtime.experiments.register("canvasInspection", "Canvas inspection");
         Runtime.experiments.register("devicesPanel", "Devices panel");
         Runtime.experiments.register("disableAgentsWhenProfile", "Disable other agents and UI when profiler is active", true);
         Runtime.experiments.register("dockToLeft", "Dock to left", true);
         Runtime.experiments.register("documentation", "JavaScript documentation", true);
         Runtime.experiments.register("fileSystemInspection", "FileSystem inspection");
         Runtime.experiments.register("gpuTimeline", "GPU data on timeline", true);
         Runtime.experiments.register("layersPanel", "Layers panel");
         Runtime.experiments.register("promiseTracker", "Enable Promise inspection");
-        Runtime.experiments.register("timelineOnTraceEvents", "Timeline on trace events");
         Runtime.experiments.register("timelinePowerProfiler", "Timeline power profiler");
         Runtime.experiments.register("timelineJSCPUProfile", "Timeline with JS sampling");
         Runtime.experiments.register("timelineInvalidationTracking", "Timeline with full invalidation tracking.");
         Runtime.experiments.cleanUpStaleExperiments();
 
         if (InspectorFrontendHost.isUnderTest()) {
             // Enable experiments for testing.
             Runtime.experiments.enableForTest("disableAgentsWhenProfile");
             var testPath = WebInspector.settings.testPath.get();
             if (testPath.indexOf("timeline/") !== -1 || testPath.indexOf("layers/") !== -1)
                 Runtime.experiments.enableForTest("layersPanel");
-            if (testPath.indexOf("tracing/") !== -1)
-                Runtime.experiments.enableForTest("timelineOnTraceEvents");
             if (testPath.indexOf("documentation/") !== -1)
                 Runtime.experiments.enableForTest("documentation");
             if (testPath.indexOf("elements/") !== -1)
                 Runtime.experiments.enableForTest("animationInspection");
         } else {
             Runtime.experiments.setDefaultExperiments([
-                "timelineOnTraceEvents",
                 "disableAgentsWhenProfile",
                 "timelineJSCPUProfile",
             ]);
         }
     },
 
     /**
      * @suppressGlobalPropertiesCheck
      */
     _createAppUI: function()
@@ skipping 702 matching lines @@
     /**
      * @param {!WebInspector.Event} event
      */
     _inspectNode: function(event)
     {
         WebInspector.Revealer.reveal(/** @type {!WebInspector.DOMNode} */ (event.data));
     }
 }
 
 new WebInspector.Main();