[Sync] Convert sync to a static library.

components/sync/engine_impl/worker_entity_tracker.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_WORKER_ENTITY_TRACKER_H_
 #define COMPONENTS_SYNC_ENGINE_IMPL_WORKER_ENTITY_TRACKER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/macros.h"
 #include "base/time/time.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/protocol/sync.pb.h"
 
 namespace syncer_v2 {
 struct CommitRequestData;
 struct CommitResponseData;
 struct UpdateResponseData;
 
 // Manages the pending commit and update state for an entity on the sync
 // thread.
 //
 // It should be considered a helper class internal to the
 // ModelTypeWorker.
 //
 // Maintains the state associated with a particular sync entity which is
 // necessary for decision-making on the sync thread.  It can track pending
 // commit state, received update state, and can detect conflicts.
 //
 // This object may contain state associated with a pending commit, pending
 // update, or both.
-class SYNC_EXPORT WorkerEntityTracker {
+class WorkerEntityTracker {
  public:
   // Initializes the entity tracker's main fields. Does not initialize state
   // related to a pending commit.
   WorkerEntityTracker(const std::string& id,
                       const std::string& client_tag_hash);
 
   ~WorkerEntityTracker();
 
   // Returns true if this entity should be commited to the server.
   bool HasPendingCommit() const;
@@ skipping 70 matching lines @@
   // of an pending update prevents commits.  As of this writing, the only
   // source of pending updates is updates that can't currently be decrypted.
   std::unique_ptr<UpdateResponseData> encrypted_update_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkerEntityTracker);
 };
 
 }  // namespace syncer_v2
 
 #endif  // COMPONENTS_SYNC_ENGINE_IMPL_WORKER_ENTITY_TRACKER_H_