[Sync] Convert sync to a static library.

components/sync/syncable/syncable_write_transaction.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_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_
 #define COMPONENTS_SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_
 
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/macros.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/syncable/entry_kernel.h"
 #include "components/sync/syncable/syncable_base_write_transaction.h"
 
 namespace syncer {
 namespace syncable {
 
-SYNC_EXPORT extern const int64_t kInvalidTransactionVersion;
+extern const int64_t kInvalidTransactionVersion;
 
 // Locks db in constructor, unlocks in destructor.
-class SYNC_EXPORT WriteTransaction : public BaseWriteTransaction {
+class WriteTransaction : public BaseWriteTransaction {
  public:
   WriteTransaction(const tracked_objects::Location& from_here,
                    WriterTag writer,
                    Directory* directory);
 
   // Constructor used for getting back transaction version after making sync
   // API changes to one model. If model is changed by the transaction,
   // the new transaction version of the model and modified nodes will be saved
   // in |transaction_version| upon destruction of the transaction. If model is
   // not changed,  |transaction_version| will be kInvalidTransactionVersion.
@@ skipping 32 matching lines @@
   // indeed changed. kInvalidTransactionVersion otherwise. Not owned.
   int64_t* transaction_version_;
 
   DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
 };
 
 }  // namespace syncable
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_SYNCABLE_SYNCABLE_WRITE_TRANSACTION_H_