[Sync] Convert sync to a static library.

components/sync/core/attachments/attachment_store_frontend.h

 // Copyright 2015 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 COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_
 #define COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 11 matching lines @@
 
 // AttachmentStoreFrontend is helper to post AttachmentStore calls to backend on
 // different thread. Backend is expected to know on which thread to post
 // callbacks with results.
 // AttachmentStoreFrontend takes ownership of backend. Backend is deleted on
 // backend thread.
 // AttachmentStoreFrontend is not thread safe, it should only be accessed from
 // model thread.
 // Method signatures of AttachmentStoreFrontend match exactly methods of
 // AttachmentStoreBackend.
-class SYNC_EXPORT AttachmentStoreFrontend
+class AttachmentStoreFrontend
     : public base::RefCounted<AttachmentStoreFrontend>,
       public base::NonThreadSafe {
  public:
   AttachmentStoreFrontend(
       std::unique_ptr<AttachmentStoreBackend> backend,
       const scoped_refptr<base::SequencedTaskRunner>& backend_task_runner);
 
   void Init(const AttachmentStore::InitCallback& callback);
 
   void Read(AttachmentStore::Component component,
@@ skipping 22 matching lines @@
 
   std::unique_ptr<AttachmentStoreBackend> backend_;
   scoped_refptr<base::SequencedTaskRunner> backend_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(AttachmentStoreFrontend);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_ATTACHMENTS_ATTACHMENT_STORE_FRONTEND_H_