Fix missing HEADLESS_EXPORT defines

headless/public/util/deterministic_http_protocol_handler.h

 // Copyright 2016 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 HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_
 #define HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_
 
 #include <memory>
 
 #include "base/single_thread_task_runner.h"
+#include "headless/public/headless_export.h"
 #include "net/url_request/url_request_job_factory.h"
 
 namespace net {
 class URLRequestContext;
 class URLRequestJobFactory;
 }  // namespace
 
 namespace headless {
 class DeterministicDispatcher;
 
 // A deterministic protocol handler.  Requests made to this protocol handler
 // will return in order of creation, regardless of what order the network
 // returns them in.  This helps remove one large source of network related
 // non determinism at the cost of slower page loads.
-class DeterministicHttpProtocolHandler
+class HEADLESS_EXPORT DeterministicHttpProtocolHandler
     : public net::URLRequestJobFactory::ProtocolHandler {
  public:
   // Note |deterministic_dispatcher| is expected to be shared across a number of
   // protocol handlers, e.g. for http & https protocols.
   DeterministicHttpProtocolHandler(
       DeterministicDispatcher* deterministic_dispatcher,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
   ~DeterministicHttpProtocolHandler() override;
 
   net::URLRequestJob* MaybeCreateJob(
@@ skipping 13 matching lines @@
   // http resources.
   mutable std::unique_ptr<net::URLRequestContext> url_request_context_;
   mutable std::unique_ptr<net::URLRequestJobFactory> url_request_job_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DeterministicHttpProtocolHandler);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_UTIL_DETERMINISTIC_HTTP_PROTOCOL_HANDLER_H_