Fix missing HEADLESS_EXPORT defines

headless/public/util/url_request_dispatcher.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_URL_REQUEST_DISPATCHER_H_
 #define HEADLESS_PUBLIC_UTIL_URL_REQUEST_DISPATCHER_H_
 
 #include "base/macros.h"
+#include "headless/public/headless_export.h"
 #include "net/base/net_errors.h"
 
 namespace headless {
 class ManagedDispatchURLRequestJob;
 class NavigationRequest;
 
 // Interface to abstract and potentially reorder (for determinism) calls to
 // ManagedDispatchUrlRequestJob::OnHeadersComplete and
 // ManagedDispatchUrlRequestJob::NotifyStartError.
-class URLRequestDispatcher {
+class HEADLESS_EXPORT URLRequestDispatcher {
  public:
   URLRequestDispatcher() {}
   virtual ~URLRequestDispatcher() {}
 
   // Tells us a URLRequestJob was created. Can be called from any thread.
   virtual void JobCreated(ManagedDispatchURLRequestJob* job) = 0;
 
   // Tells us a URLRequestJob got killed. Can be called from any thread.
   virtual void JobKilled(ManagedDispatchURLRequestJob* job) = 0;
 
@@ skipping 12 matching lines @@
   virtual void NavigationRequested(
       std::unique_ptr<NavigationRequest> navigation_request) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(URLRequestDispatcher);
 };
 
 }  // namespace headless
 
 #endif  // HEADLESS_PUBLIC_UTIL_URL_REQUEST_DISPATCHER_H_