[Sync] Convert sync to a static library.

components/sync/core/processor_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_CORE_PROCESSOR_ENTITY_TRACKER_H_
 #define COMPONENTS_SYNC_CORE_PROCESSOR_ENTITY_TRACKER_H_
 
 #include <stdint.h>
 
 #include <memory>
 #include <string>
 
 #include "base/time/time.h"
 #include "components/sync/api/entity_data.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/protocol/entity_metadata.pb.h"
 
 namespace syncer_v2 {
 struct CommitRequestData;
 struct CommitResponseData;
 struct UpdateResponseData;
 
 // This class is used by the SharedModelTypeProcessor to track the state of each
 // entity with its type. It can be considered a helper class internal to the
 // processor. It manages the metadata for its entity and caches entity data
 // upon a local change until commit confirmation is received.
-class SYNC_EXPORT ProcessorEntityTracker {
+class ProcessorEntityTracker {
  public:
   // Construct an instance representing a new locally-created item.
   static std::unique_ptr<ProcessorEntityTracker> CreateNew(
       const std::string& client_tag,
       const std::string& client_tag_hash,
       const std::string& id,
       base::Time creation_time);
 
   // Construct an instance representing an item loaded from storage on init.
   // This method swaps out the contents of |metadata|.
@@ skipping 107 matching lines @@
   // The data is reset once commit confirmation is received.
   EntityDataPtr commit_data_;
 
   // The sequence number of the last item sent to the sync thread.
   int64_t commit_requested_sequence_number_;
 };
 
 }  // namespace syncer_v2
 
 #endif  // COMPONENTS_SYNC_CORE_PROCESSOR_ENTITY_TRACKER_H_