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

sync/syncable/nigori_handler.h

Index: sync/syncable/nigori_handler.h
diff --git a/sync/syncable/nigori_handler.h b/sync/syncable/nigori_handler.h
index 952aee121e694821dd844b7a0978fade2662caae..d39ddf92a50ac6e278fd1a6fb346fa4c6766f484 100644
--- a/sync/syncable/nigori_handler.h
+++ b/sync/syncable/nigori_handler.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_NIGORI_HANDLER_H_
 #define SYNC_SYNCABLE_NIGORI_HANDLER_H_
 
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 
 namespace google{
@@ -26,7 +27,7 @@ class BaseTransaction;
 // Sync internal interface for dealing with nigori node and querying
 // the current set of encrypted types. Not thread safe, so a sync transaction
 // must be held by a caller whenever invoking methods.
-class NigoriHandler {
+class SYNC_EXPORT_PRIVATE NigoriHandler {
  public:
   NigoriHandler();
   virtual ~NigoriHandler();