Convert PDF component IPC to mojo.

content/public/common/referrer_struct_traits.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 CONTENT_PUBLIC_COMMON_REFERRER_STRUCT_TRAITS_H_
 #define CONTENT_PUBLIC_COMMON_REFERRER_STRUCT_TRAITS_H_
 
+#include "content/common/content_export.h"
 #include "content/public/common/referrer.h"
 #include "third_party/WebKit/public/platform/referrer.mojom.h"
 
 namespace mojo {
 
 template <>
-struct StructTraits<::blink::mojom::ReferrerDataView, content::Referrer> {
+struct CONTENT_EXPORT
+    StructTraits<::blink::mojom::ReferrerDataView, content::Referrer> {
   static const GURL& url(const content::Referrer& r) {
     return r.url;
   }
 
   static ::blink::WebReferrerPolicy policy(const content::Referrer& r) {
     return r.policy;
   }
 
   static bool Read(::blink::mojom::ReferrerDataView data,
                    content::Referrer* out);
 };
 
 }
 
 #endif  // CONTENT_PUBLIC_COMMON_REFERRER_STRUCT_TRAITS_H_