DevTools: Replace Apple styled spinner icon with Chromium one.

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 422 matching lines @@
             'front_end/Images/resourceDocumentIconSmall.png',
             'front_end/Images/resourceJSIcon.png',
             'front_end/Images/resourcePlainIcon.png',
             'front_end/Images/resourcePlainIconSmall.png',
             'front_end/Images/resourcesTimeGraphIcon.png',
             'front_end/Images/searchNext.png',
             'front_end/Images/searchPrev.png',
             'front_end/Images/sessionStorage.png',
             'front_end/Images/settingsListRemove.png',
             'front_end/Images/settingsListRemove_2x.png',
-            'front_end/Images/spinner.gif',
-            'front_end/Images/spinnerSelected.gif',
             'front_end/Images/statusbarButtonGlyphs.png',
             'front_end/Images/statusbarButtonGlyphs_2x.png',
             'front_end/Images/statusbarResizerHorizontal.png',
             'front_end/Images/statusbarResizerVertical.png',
             'front_end/Images/thumbActiveHoriz.png',
             'front_end/Images/thumbActiveVert.png',
             'front_end/Images/thumbHoriz.png',
             'front_end/Images/thumbVert.png',
             'front_end/Images/thumbHoverHoriz.png',
             'front_end/Images/thumbHoverVert.png',
@@ skipping 16 matching lines @@
             'front_end/TempStorageSharedWorker.js',
         ],
         'devtools_script_formatter_worker_js_files': [
             'front_end/CSSFormatter.js',
             'front_end/JavaScriptFormatter.js',
             'front_end/ScriptFormatterWorker.js',
             'front_end/utilities.js',
         ],
     },
 }