[Sync] Convert sync to a static library.

components/sync/core/read_node.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_CORE_READ_NODE_H_
 #define COMPONENTS_SYNC_CORE_READ_NODE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "components/sync/base/model_type.h"
-#include "components/sync/base/sync_export.h"
 #include "components/sync/core/base_node.h"
 
 namespace syncer {
 
 // ReadNode wraps a syncable::Entry to provide the functionality of a
 // read-only BaseNode.
-class SYNC_EXPORT ReadNode : public BaseNode {
+class ReadNode : public BaseNode {
  public:
   // Create an unpopulated ReadNode on the given transaction.  Call some flavor
   // of Init to populate the ReadNode with a database entry.
   explicit ReadNode(const BaseTransaction* transaction);
   ~ReadNode() override;
 
   // A client must use one (and only one) of the following Init variants to
   // populate the node.
 
   // BaseNode implementation.
@@ skipping 36 matching lines @@
 
   // The sync API transaction that is the parent of this node.
   const BaseTransaction* transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadNode);
 };
 
 }  // namespace syncer
 
 #endif  // COMPONENTS_SYNC_CORE_READ_NODE_H_