DevTools: merge TracingTimelineModel into TimelineModel

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 521 matching lines @@
             'front_end/timeline/TimelineModel.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/TimelineView.js',
             'front_end/timeline/TracingModel.js',
-            'front_end/timeline/TracingTimelineModel.js',
             'front_end/timeline/TransformController.js',
         ],
 
         # Third-party code.
         'devtools_cm_css_files': [
             'front_end/cm/codemirror.css',
         ],
         'devtools_cm_js_files': [
             'front_end/cm/clike.js',
             'front_end/cm/closebrackets.js',
@@ skipping 108 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',
         ],
     },
 }