Standardize usage of virtual/override/final in sync/

sync/internal_api/public/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 SYNC_INTERNAL_API_PUBLIC_READ_NODE_H_
 #define SYNC_INTERNAL_API_PUBLIC_READ_NODE_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "sync/base/sync_export.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/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 {
  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);
-  virtual ~ReadNode();
+  ~ReadNode() override;
 
   // A client must use one (and only one) of the following Init variants to
   // populate the node.
 
   // BaseNode implementation.
-  virtual InitByLookupResult InitByIdLookup(int64 id) override;
-  virtual InitByLookupResult InitByClientTagLookup(
-      ModelType model_type,
-      const std::string& tag) override;
+  InitByLookupResult InitByIdLookup(int64 id) override;
+  InitByLookupResult InitByClientTagLookup(ModelType model_type,
+                                           const std::string& tag) override;
 
   // There is always a root node, so this can't fail.  The root node is
   // never mutable, so root lookup is only possible on a ReadNode.
   void InitByRootLookup();
 
   // Returns the type root node, if it exists.  This is usually created by the
   // server during first sync.  Eventually, we plan to remove support for it
   // from the protocol and have the client create the node instead.
   InitByLookupResult InitTypeRoot(ModelType type);
 
   // Returns a server-created and unique-server-tagged item.
   //
   // This functionality is only useful for bookmarks because only bookmarks
   // have server-tagged items.  All other server-tagged items are type root
   // nodes, which should be looked up with InitTypeRoot().
   InitByLookupResult InitByTagLookupForBookmarks(const std::string& tag);
 
   // Implementation of BaseNode's abstract virtual accessors.
-  virtual const syncable::Entry* GetEntry() const override;
-  virtual const BaseTransaction* GetTransaction() const override;
+  const syncable::Entry* GetEntry() const override;
+  const BaseTransaction* GetTransaction() const override;
 
  protected:
   ReadNode();
 
  private:
   void* operator new(size_t size);  // Node is meant for stack use only.
 
   // The underlying syncable object which this class wraps.
   syncable::Entry* entry_;
 
   // The sync API transaction that is the parent of this node.
   const BaseTransaction* transaction_;
 
   DISALLOW_COPY_AND_ASSIGN(ReadNode);
 };
 
 }  // namespace syncer
 
 #endif  // SYNC_INTERNAL_API_PUBLIC_READ_NODE_H_