DevTools: Support debug_devtools=true arg in GN builds

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 435 matching lines @@
             'front_end/resources/ResourcesPanel.js',
         ],
         'devtools_script_formatter_worker_js_files': [
             'front_end/cm/css.js',
             'front_end/cm/headlesscodemirror.js',
             'front_end/cm/htmlmixed.js',
             'front_end/cm/javascript.js',
             'front_end/cm/xml.js',
             'front_end/common/WebInspector.js',
             'front_end/common/utilities.js',
-            'front_end/common/utilities.js',
             'front_end/script_formatter_worker/CSSFormatter.js',
             'front_end/script_formatter_worker/JavaScriptFormatter.js',
             'front_end/script_formatter_worker/ScriptFormatterWorker.js',
         ],
         'devtools_settings_js_files': [
             'front_end/settings/EditFileSystemDialog.js',
             'front_end/settings/FrameworkBlackboxDialog.js',
             'front_end/settings/SettingsScreen.js',
         ],
         'devtools_source_frame_js_files': [
@@ skipping 101 matching lines @@
             '<@(devtools_documentation_js_files)',
             '<@(devtools_elements_js_files)',
             '<@(devtools_extensions_js_files)',
             '<@(devtools_heap_snapshot_worker_js_files)',
             '<@(devtools_layers_js_files)',
             '<@(devtools_network_js_files)',
             '<@(devtools_profiler_js_files)',
             '<@(devtools_promises_js_files)',
             '<@(devtools_resources_js_files)',
             '<@(devtools_script_formatter_worker_js_files)',
+            '<@(devtools_settings_js_files)',
             '<@(devtools_source_frame_js_files)',
             '<@(devtools_sources_js_files)',
             '<@(devtools_temp_storage_shared_worker_js_files)',
             '<@(devtools_timeline_js_files)',
         ],
         'devtools_image_files': [
             'front_end/Images/applicationCache.png',
             'front_end/Images/back.png',
             'front_end/Images/breakpoint.png',
             'front_end/Images/breakpoint_2x.png',
@@ skipping 60 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',
         ],
     },
 }