Don't need to export an abstract interface.

net/url_request/fraudulent_certificate_reporter.h

 // Copyright (c) 2011 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_URL_REQUEST_FRAUDULENT_CERTIFICATE_REPORTER_H_
 #define NET_URL_REQUEST_FRAUDULENT_CERTIFICATE_REPORTER_H_
 
 #include <string>
 
-#include "net/base/net_export.h"
-
 namespace net {
 
 class SSLInfo;
 
 // FraudulentCertificateReporter is an interface for asynchronously
 // reporting certificate chains that fail the certificate pinning
 // check.
-class NET_EXPORT FraudulentCertificateReporter {
+class FraudulentCertificateReporter {
  public:
-  virtual ~FraudulentCertificateReporter();
+  virtual ~FraudulentCertificateReporter() {}
 
   // Sends a report to the report collection server containing the |ssl_info|
   // associated with a connection to |hostname|. If |sni_available| is true,
   // searches the SNI transport security metadata as well as the usual
   // transport security metadata when determining policy for sending the report.
   virtual void SendReport(const std::string& hostname,
                           const SSLInfo& ssl_info,
                           bool sni_available) = 0;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_FRAUDULENT_CERTIFICATE_REPORTER_H_