DevTools: remove old Timeline front-end implementation

Source/devtools/devtools.gypi

 #
 # Copyright (C) 2013 Google 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.
 #         * Redistributions in binary form must reproduce the above
@@ skipping 148 matching lines @@
             'front_end/sdk/PaintProfiler.js',
             'front_end/sdk/PowerProfiler.js',
             'front_end/sdk/RemoteObject.js',
             'front_end/sdk/Resource.js',
             'front_end/sdk/ResourceTreeModel.js',
             'front_end/sdk/RuntimeModel.js',
             'front_end/sdk/Script.js',
             'front_end/sdk/SnippetStorage.js',
             'front_end/sdk/SourceMap.js',
             'front_end/sdk/Target.js',
-            'front_end/sdk/TimelineManager.js',
             'front_end/sdk/TracingManager.js',
             'front_end/sdk/WorkerManager.js',
             'front_end/sdk/WorkerTargetManager.js',
         ],
         'devtools_workspace_js_files': [
             'front_end/workspace/FileManager.js',
             'front_end/workspace/FileSystemMapping.js',
             'front_end/workspace/FileSystemWorkspaceBinding.js',
             'front_end/workspace/IsolatedFileSystem.js',
             'front_end/workspace/IsolatedFileSystemManager.js',
@@ skipping 343 matching lines @@
             'front_end/timeline/MemoryCountersGraph.js',
             'front_end/timeline/PaintProfilerView.js',
             'front_end/timeline/TimelineEventOverview.js',
             'front_end/timeline/TimelineFlameChart.js',
             'front_end/timeline/TimelineFrameModel.js',
             'front_end/timeline/TimelineFrameOverview.js',
             'front_end/timeline/TimelineJSProfile.js',
             'front_end/timeline/TimelineLayersView.js',
             'front_end/timeline/TimelineMemoryOverview.js',
             'front_end/timeline/TimelineModel.js',
-            'front_end/timeline/TimelineModelImpl.js',
             'front_end/timeline/TimelineOverviewPane.js',
             'front_end/timeline/TimelinePaintProfilerView.js',
             'front_end/timeline/TimelinePanel.js',
             'front_end/timeline/TimelinePowerGraph.js',
             'front_end/timeline/TimelinePowerOverview.js',
             'front_end/timeline/TimelinePresentationModel.js',
             'front_end/timeline/TimelineUIUtils.js',
-            'front_end/timeline/TimelineUIUtilsImpl.js',
             'front_end/timeline/TimelineView.js',
             'front_end/timeline/TracingModel.js',
             'front_end/timeline/TracingTimelineModel.js',
             'front_end/timeline/TracingTimelineUIUtils.js',
             'front_end/timeline/TransformController.js',
         ],
 
         # Third-party code.
         'devtools_cm_css_files': [
             'front_end/cm/codemirror.css',
@@ skipping 112 matching lines @@
             'front_end/Images/touchCursor.png',
             'front_end/Images/touchCursor_2x.png',
             'front_end/Images/transformControls.png',
             'front_end/Images/transformControls_2x.png',
         ],
         'devtools_extension_api_files': [
             'front_end/extensions/ExtensionAPI.js',
         ],
     },
 }