Remove the WARNING security level.

components/security_state/security_state_model.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_SECURITY_STATE_SECURITY_STATE_MODEL_H_
 #define COMPONENTS_SECURITY_STATE_SECURITY_STATE_MODEL_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 27 matching lines @@
   enum SecurityLevel {
     // HTTP/no URL/HTTPS but with insecure passive content on the page.
     NONE,
 
     // HTTPS with valid EV cert.
     EV_SECURE,
 
     // HTTPS (non-EV) with valid cert.
     SECURE,
 
-    // HTTPS, but with an outdated protocol version.
-    SECURITY_WARNING,
-
     // HTTPS, but the certificate verification chain is anchored on a
     // certificate that was installed by the system administrator.
     SECURITY_POLICY_WARNING,
 
     // Attempted HTTPS and failed, page not authenticated, HTTPS with
     // insecure active content on the page, malware, phishing, or any other
     // serious security issue.
     SECURITY_ERROR,
   };
 
@@ skipping 134 matching lines @@
   mutable VisibleSecurityState visible_security_state_;
 
   SecurityStateModelClient* client_;
 
   DISALLOW_COPY_AND_ASSIGN(SecurityStateModel);
 };
 
 }  // namespace security_state
 
 #endif  // COMPONENTS_SECURITY_STATE_SECURITY_STATE_MODEL_H_