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

chrome/service/cloud_print/cloud_print_connector.cc

 // 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.
 
 #include "chrome/service/cloud_print/cloud_print_connector.h"
 
 #include "base/md5.h"
 #include "base/rand_util.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
@@ skipping 180 matching lines @@
           }
         }
       } else {
         NOTREACHED();
       }
     }
   }
 
   request_ = NULL;
   if (!local_printers.empty()) {
-    // Notify client that we have a list of printers available.
-    // Client will call us back to finish registration
-    client_->OnPrintersAvailable(local_printers);
+    // In the future we might want to notify frontend about available printers
+    // and let user choose which printers to register.
+    // Here is a good place to notify client about available printers.
+    RegisterPrinters(local_printers);
   }
   ContinuePendingTaskProcessing();  // Continue processing background tasks.
   return CloudPrintURLFetcher::STOP_PROCESSING;
 }
 
 CloudPrintURLFetcher::ResponseAction
 CloudPrintConnector::HandlePrinterDeleteResponse(
     const content::URLFetcher* source,
     const GURL& url,
     DictionaryValue* json_data,
@@ skipping 328 matching lines @@
                    mime_type,
                    post_data,
                    &CloudPrintConnector::HandleRegisterPrinterResponse);
 }
 
 bool CloudPrintConnector::IsSamePrinter(const std::string& name1,
                                         const std::string& name2) const {
   return (0 == base::strcasecmp(name1.c_str(), name2.c_str()));
 }