Fix net_export.h includes.

net/url_request/data_protocol_handler.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_URL_REQUEST_DATA_PROTOCOL_HANDLER_H_
 #define NET_URL_REQUEST_DATA_PROTOCOL_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
+#include "net/base/net_export.h"
 #include "net/url_request/url_request_job_factory.h"
 
 namespace net {
 
 class URLRequestJob;
 
 // Implements a ProtocolHandler for Data jobs.
 class NET_EXPORT DataProtocolHandler
     : public URLRequestJobFactory::ProtocolHandler {
  public:
   DataProtocolHandler();
   URLRequestJob* MaybeCreateJob(
       URLRequest* request,
       NetworkDelegate* network_delegate) const override;
   bool IsSafeRedirectTarget(const GURL& location) const override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(DataProtocolHandler);
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_DATA_PROTOCOL_HANDLER_H_