Update from https://crrev.com/304121

net/base/net_errors.h

 // Copyright (c) 2012 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 NET_BASE_NET_ERRORS_H__
 #define NET_BASE_NET_ERRORS_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 21 matching lines @@
 
 // Returns a textual representation of the error code for logging purposes.
 NET_EXPORT std::string ErrorToString(int error);
 
 // Same as above, but leaves off the leading "net::".
 NET_EXPORT std::string ErrorToShortString(int error);
 
 // Returns true if |error| is a certificate error code.
 NET_EXPORT bool IsCertificateError(int error);
 
+// Returns true if |error| is a client certificate authentication error. This
+// does not include ERR_SSL_PROTOCOL_ERROR which may also signal a bad client
+// certificate.
+NET_EXPORT bool IsClientCertificateError(int error);
+
 // Map system error code to Error.
 NET_EXPORT Error MapSystemError(int os_error);
 
 // Returns a list of all the possible net error codes (not counting OK). This
 // is intended for use with UMA histograms that are reporting the result of
 // an action that is represented as a net error code.
 //
 // Note that the error codes are all positive (since histograms expect positive
 // sample values). Also note that a guard bucket is created after any valid
 // error code that is not followed immediately by a valid error code.
 NET_EXPORT std::vector<int> GetAllErrorCodesForUma();
 
 // A convenient function to translate file error to net error code.
 NET_EXPORT Error FileErrorToNetError(base::File::Error file_error);
 
 }  // namespace net
 
 #endif  // NET_BASE_NET_ERRORS_H__