Change security panel overview to support neutral icons.

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 748 matching lines @@
             'front_end/Images/resourceDocumentIcon.png',
             '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/responsiveDesign.png',
             'front_end/Images/responsiveDesign_2x.png',
             'front_end/Images/searchNext.png',
             'front_end/Images/searchPrev.png',
-            'front_end/Images/securityStateHttp_2x.png',
-            'front_end/Images/securityStateHttp.png',
             'front_end/Images/securityStateInsecure_2x.png',
             'front_end/Images/securityStateInsecure.png',
+            'front_end/Images/securityStateNeutral_2x.png',
+            'front_end/Images/securityStateNeutral.png',
             'front_end/Images/securityStateSecure_2x.png',
             'front_end/Images/securityStateSecure.png',
             'front_end/Images/securityStateWarning_2x.png',
             'front_end/Images/securityStateWarning.png',
             'front_end/Images/serviceWorker.svg',
             'front_end/Images/sessionStorage.png',
             'front_end/Images/settingsListRemove.png',
             'front_end/Images/settingsListRemove_2x.png',
             'front_end/Images/speech.png',
             'front_end/Images/toolbarButtonGlyphs.png',
             'front_end/Images/toolbarButtonGlyphs_2x.png',
             'front_end/Images/toolbarResizerHorizontal.png',
             'front_end/Images/toolbarResizerVertical.png',
             'front_end/Images/thumbActiveHoriz.png',
             'front_end/Images/thumbActiveVert.png',
             'front_end/Images/thumbHoriz.png',
             'front_end/Images/thumbHoverHoriz.png',
             'front_end/Images/thumbHoverVert.png',
             'front_end/Images/thumbVert.png',
             'front_end/Images/toolbarItemSelected.png',
             'front_end/Images/touchCursor.png',
             'front_end/Images/touchCursor_2x.png',
             'front_end/Images/updateServiceWorker.svg',
         ],
         'devtools_extension_api_files': [
             'front_end/extensions/ExtensionAPI.js',
         ],
     },
 }