[Sync] Convert sync to a static library.

components/sync/core_impl/js_sync_manager_observer.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_IMPL_JS_SYNC_MANAGER_OBSERVER_H_
 #define COMPONENTS_SYNC_CORE_IMPL_JS_SYNC_MANAGER_OBSERVER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/base/weak_handle.h"
 #include "components/sync/core/sync_manager.h"
 #include "components/sync/protocol/sync_protocol_error.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 class JsEventDetails;
 class JsEventHandler;
 
 // Routes SyncManager events to a JsEventHandler.
-class SYNC_EXPORT JsSyncManagerObserver : public SyncManager::Observer {
+class JsSyncManagerObserver : public SyncManager::Observer {
  public:
   JsSyncManagerObserver();
   ~JsSyncManagerObserver() override;
 
   void SetJsEventHandler(const WeakHandle<JsEventHandler>& event_handler);
 
   // SyncManager::Observer implementation.
   void OnSyncCycleCompleted(
       const sessions::SyncSessionSnapshot& snapshot) override;
   void OnConnectionStatusChange(ConnectionStatus status) override;
@@ skipping 12 matching lines @@
                      const JsEventDetails& details);
 
   WeakHandle<JsEventHandler> event_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(JsSyncManagerObserver);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_IMPL_JS_SYNC_MANAGER_OBSERVER_H_