[sync] Componentize sync: Part 2: Add SYNC_EXPORTs to files in src/sync/

sync/api/sync_data.h

Index: sync/api/sync_data.h
diff --git a/sync/api/sync_data.h b/sync/api/sync_data.h
index b88e0e7340a463ffb79bde13eba73c60d4d4cd62..c3404c386c874a114da61551f2e6e2102b81ff7f 100644
--- a/sync/api/sync_data.h
+++ b/sync/api/sync_data.h
@@ -1,4 +1,4 @@
-// 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.
 
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/util/immutable.h"
 
@@ -22,7 +23,7 @@ namespace syncer {
 
 // A light-weight container for immutable sync data. Pass-by-value and storage
 // in STL containers are supported and encouraged if helpful.
-class SyncData {
+class SYNC_EXPORT SyncData {
  public:
   // Creates an empty and invalid SyncData.
   SyncData();