db/API.js: reuse the already required padMessageHandler (2 of 2)

It was introduced on 2014-11-12 by commit 9d39c9591a ("update pad clients").

src/node/db/API.js

@@ -740,7 +740,6 @@ exports.deletePad = function(padID, callback)
 exports.restoreRevision = function (padID, rev, callback)
 {
   var Changeset = require("ep_etherpad-lite/static/js/Changeset");
-  var padMessage = require("ep_etherpad-lite/node/handler/PadMessageHandler.js");
 
   //check if rev is a number
   if (rev !== undefined && typeof rev != "number")
@@ -830,7 +829,7 @@ exports.restoreRevision = function (padID, rev, callback)
       //append the changeset
       pad.appendRevision(changeset);
       //
-      padMessage.updatePadClients(pad, function ()
+      padMessageHandler.updatePadClients(pad, function ()
       {
       });
       callback(null, null);