Replace GetAllErrorCodesForUma calls with UMA_HISTOGRAM_SPARSE_SLOWLY.

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 30 matching lines @@
 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(logging::SystemErrorCode 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__