[Sync] Convert sync to a static library.

components/sync/engine_impl/nudge_handler.h

 // Copyright 2014 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_ENGINE_IMPL_NUDGE_HANDLER_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_NUDGE_HANDLER_H_
 
 #include "base/compiler_specific.h"
 #include "components/sync/base/model_type.h"
-#include "components/sync/base/sync_export.h"
 
 namespace syncer {
 
-class SYNC_EXPORT NudgeHandler {
+class NudgeHandler {
  public:
   NudgeHandler();
   virtual ~NudgeHandler();
 
   virtual void NudgeForInitialDownload(syncer::ModelType type) = 0;
   virtual void NudgeForCommit(syncer::ModelType type) = 0;
   virtual void NudgeForRefresh(syncer::ModelType type) = 0;
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_NUDGE_HANDLER_H_