[sync] Componentize sync: Part 6: Add more SYNC_EXPORTs to files in src/sync/

sync/syncable/directory_change_delegate.h

Index: sync/syncable/directory_change_delegate.h
diff --git a/sync/syncable/directory_change_delegate.h b/sync/syncable/directory_change_delegate.h
index 725a3446f3f8185a05d3ca2744daa085995155f2..fb76450f2b3fc7bc21be7873165ad9322eb8a5c6 100644
--- a/sync/syncable/directory_change_delegate.h
+++ b/sync/syncable/directory_change_delegate.h
@@ -1,10 +1,11 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// 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 SYNC_SYNCABLE_DIRECTORY_CHANGE_DELEGATE_H_
 #define SYNC_SYNCABLE_DIRECTORY_CHANGE_DELEGATE_H_
 
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/syncable/write_transaction_info.h"
 
@@ -21,7 +22,7 @@ namespace syncable {
 //    (HandleTransactionCompleteChangeEvent).
 //
 // Note that these methods may be called on *any* thread.
-class DirectoryChangeDelegate {
+class SYNC_EXPORT_PRIVATE DirectoryChangeDelegate {
  public:
   // Returns the handles of changed entries in |entry_changed|.
   virtual void HandleCalculateChangesChangeEventFromSyncApi(