DevTools Security Panel: Use the new security indicators.

third_party/WebKit/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 863 matching lines @@
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-            'front_end/Images/securityPropertyUnknown.svg',
-            'front_end/Images/securityStateInsecure.svg',
-            'front_end/Images/securityStateNeutral.svg',
-            'front_end/Images/securityStateSecure.svg',
+            'front_end/Images/securityIcons_2x.png',
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         ],
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     },
 }