Fix missing HEADLESS_EXPORT defines

headless/public/util/generic_url_request_job.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_GENERIC_URL_REQUEST_JOB_H_
 #define HEADLESS_PUBLIC_UTIL_GENERIC_URL_REQUEST_JOB_H_
 
 #include <stddef.h>
 #include <functional>
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "headless/public/headless_export.h"
 #include "headless/public/util/managed_dispatch_url_request_job.h"
 #include "headless/public/util/url_fetcher.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request.h"
 #include "url/gurl.h"
 
 namespace net {
 class HttpResponseHeaders;
 class IOBuffer;
 }  // namespace net
 
 namespace headless {
 
 class URLRequestDispatcher;
 
 // Intended for use in a protocol handler, this ManagedDispatchURLRequestJob has
 // the following features:
 //
 // 1. The delegate can extension observe / cancel and redirect requests
 // 2. The delegate can optionally provide the results, otherwise the specifed
 //    fetcher is invoked.
-class GenericURLRequestJob : public ManagedDispatchURLRequestJob,
-                             public URLFetcher::ResultListener {
+class HEADLESS_EXPORT GenericURLRequestJob
+    : public ManagedDispatchURLRequestJob,
+      public URLFetcher::ResultListener {
  public:
   enum class RewriteResult { kAllow, kDeny, kFailure };
   using RewriteCallback = std::function<
       void(RewriteResult result, const GURL& url, const std::string& method)>;
 
   struct HttpResponse {
     GURL final_url;
     int http_response_code;
 
     // The HTTP headers and response body. Note the lifetime of |response_data|
@@ skipping 80 matching lines @@
   base::TimeTicks response_time_;
 
   base::WeakPtrFactory<GenericURLRequestJob> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(GenericURLRequestJob);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_UTIL_GENERIC_URL_REQUEST_JOB_H_