modify CertVerifier Class

* respond to multiple similar verification requests.
* accept net error result as callback response.

lib/browser/rpc-server.js

@@ -222,6 +222,7 @@ const unwrapArgs = function (sender, args) {
             removeRemoteListenersAndLogWarning(meta, args, callIntoRenderer)
           }
         }
+        Object.defineProperty(callIntoRenderer, 'length', { value: meta.length })
 
         v8Util.setRemoteCallbackFreer(callIntoRenderer, meta.id, sender)
         rendererFunctions.set(objectId, callIntoRenderer)