[Sync] Convert sync to a static library.

components/sync/base/syncer_error.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_BASE_SYNCER_ERROR_H_
 #define COMPONENTS_SYNC_BASE_SYNCER_ERROR_H_
 
-#include "components/sync/base/sync_export.h"
-
 namespace syncer {
 
 // This enum describes all the possible results of a sync cycle.
 enum SyncerError {
   UNSET = 0,       // Default value.
   CANNOT_DO_WORK,  // A model worker could not process a work item.
 
   NETWORK_CONNECTION_UNAVAILABLE,  // Connectivity failure.
   NETWORK_IO_ERROR,                // Response buffer read error.
   SYNC_SERVER_ERROR,               // Non auth HTTP error.
@@ skipping 15 matching lines @@
   SERVER_RETURN_CLIENT_DATA_OBSOLETE,
 
   // A datatype decided the sync cycle needed to be performed again.
   DATATYPE_TRIGGERED_RETRY,
 
   SERVER_MORE_TO_DOWNLOAD,
 
   SYNCER_OK
 };
 
-SYNC_EXPORT const char* GetSyncerErrorString(SyncerError);
+const char* GetSyncerErrorString(SyncerError);
 
 // Helper to check that |error| is set to something (not UNSET) and is not
 // SYNCER_OK.
 bool SyncerErrorIsError(SyncerError error);
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_BASE_SYNCER_ERROR_H_