[Sync] Convert sync to a static library.

components/sync/core/sync_manager_factory.h

 // Copyright 2012 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_SYNC_MANAGER_FACTORY_H_
 #define COMPONENTS_SYNC_CORE_SYNC_MANAGER_FACTORY_H_
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
 class SyncManager;
 
 // Helper class to allow dependency injection of the SyncManager in tests.
-class SYNC_EXPORT SyncManagerFactory {
+class SyncManagerFactory {
  public:
   SyncManagerFactory();
   virtual ~SyncManagerFactory();
 
   virtual std::unique_ptr<SyncManager> CreateSyncManager(
       const std::string& name);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(SyncManagerFactory);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_SYNC_MANAGER_FACTORY_H_