[Sync] Convert sync to a static library.

components/sync/core/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_CORE_WRITE_TRANSACTION_H_
 #define COMPONENTS_SYNC_CORE_WRITE_TRANSACTION_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/sync/api/sync_change_processor.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/core/base_transaction.h"
 
 namespace tracked_objects {
 class Location;
 }  // namespace tracked_objects
 
 namespace syncer {
 
 namespace syncable {
 class BaseTransaction;
 class WriteTransaction;
 }  // namespace syncable
 
 // Sync API's WriteTransaction is a read/write BaseTransaction.  It wraps
 // a syncable::WriteTransaction.
 //
 // NOTE: Only a single model type can be mutated for a given
 // WriteTransaction.
-class SYNC_EXPORT WriteTransaction : public BaseTransaction {
+class WriteTransaction : public BaseTransaction {
  public:
   // Start a new read/write transaction.
   WriteTransaction(const tracked_objects::Location& from_here,
                    UserShare* share);
   // |transaction_version| stores updated model and nodes version if model
   // is changed by the transaction, or syncer::syncable::kInvalidTransaction
   // if not after transaction is closed. This constructor is used for model
   // types that support embassy data.
   WriteTransaction(const tracked_objects::Location& from_here,
                    UserShare* share,
@@ skipping 28 matching lines @@
 
   // The underlying syncable object which this class wraps.
   syncable::WriteTransaction* transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(WriteTransaction);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_WRITE_TRANSACTION_H_