Remove the WARNING security level.

third_party/WebKit/public/platform/WebURLResponse.h

 /*
  * Copyright (C) 2009 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 39 matching lines @@
 public:
     enum HTTPVersion { HTTPVersionUnknown,
         HTTPVersion_0_9,
         HTTPVersion_1_0,
         HTTPVersion_1_1,
         HTTPVersion_2_0 };
     enum SecurityStyle {
         SecurityStyleUnknown,
         SecurityStyleUnauthenticated,
         SecurityStyleAuthenticationBroken,
-        SecurityStyleWarning,
         SecurityStyleAuthenticated
     };
 
     struct SignedCertificateTimestamp {
         SignedCertificateTimestamp() {}
         SignedCertificateTimestamp(
             WebString status,
             WebString origin,
             WebString logDescription,
             WebString logId,
@@ skipping 252 matching lines @@
     // instance it contains.
     std::unique_ptr<ResourceResponseContainer> m_ownedResourceResponse;
 
     // Should never be null.
     ResourceResponse* m_resourceResponse;
 };
 
 } // namespace blink
 
 #endif