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

sync/syncable/mutable_entry.h

Index: sync/syncable/mutable_entry.h
diff --git a/sync/syncable/mutable_entry.h b/sync/syncable/mutable_entry.h
index f01fcf6b9e7234b5f996b324cd492f414b38875f..cf7768af703a896c2efc514489235da56f74c22a 100644
--- a/sync/syncable/mutable_entry.h
+++ b/sync/syncable/mutable_entry.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_MUTABLE_ENTRY_H_
 #define SYNC_SYNCABLE_MUTABLE_ENTRY_H_
 
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/node_ordinal.h"
 #include "sync/syncable/entry.h"
 #include "sync/syncable/metahandle_set.h"
@@ -26,7 +27,7 @@ enum CreateNewUpdateItem {
 
 // A mutable meta entry.  Changes get committed to the database when the
 // WriteTransaction is destroyed.
-class MutableEntry : public Entry {
+class SYNC_EXPORT_PRIVATE MutableEntry : public Entry {
   void Init(WriteTransaction* trans, const Id& parent_id,
       const std::string& name);