Remove the WARNING security level.

third_party/WebKit/Source/platform/network/ResourceResponse.h

 /*
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ 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
     };
 
     class PLATFORM_EXPORT SignedCertificateTimestamp final {
     public:
         SignedCertificateTimestamp(
             String status,
             String origin,
             String logDescription,
             String logId,
@@ skipping 402 matching lines @@
     unsigned short m_remotePort;
     long long m_encodedBodyLength;
     long long m_decodedBodyLength;
     String m_downloadedFilePath;
     RefPtr<BlobDataHandle> m_downloadedFileHandle;
 };
 
 } // namespace blink
 
 #endif // ResourceResponse_h