Fixed crash in the proxy. Reference has been passed between threads,

chrome/service/cloud_print/cloud_print_connector.h

 // Copyright (c) 2011 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 CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONNECTOR_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONNECTOR_H_
 #pragma once
 
 #include <list>
 #include <map>
@@ skipping 12 matching lines @@
 // one-by-one in FIFO order.
 // CloudPrintConnector will notify client over Client interface.
 class CloudPrintConnector
     : public base::RefCountedThreadSafe<CloudPrintConnector>,
       public cloud_print::PrintServerWatcherDelegate,
       public PrinterJobHandlerDelegate,
       public CloudPrintURLFetcherDelegate {
  public:
   class Client {
    public:
-    virtual void OnPrintersAvailable(const printing::PrinterList& printers) = 0;
     virtual void OnAuthFailed() = 0;
    protected:
      virtual ~Client() {}
   };
 
   CloudPrintConnector(Client* client,
                       const std::string& proxy_id,
                       const GURL& cloud_print_server_url,
                       const DictionaryValue* print_system_settings);
   virtual ~CloudPrintConnector();
@@ skipping 134 matching lines @@
   // The CloudPrintURLFetcher instance for the current request.
   scoped_refptr<CloudPrintURLFetcher> request_;
   // The CloudPrintURLFetcher instance for the user message request.
   scoped_refptr<CloudPrintURLFetcher> user_message_request_;
 
   DISALLOW_COPY_AND_ASSIGN(CloudPrintConnector);
 };
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_CONNECTOR_H_