Added a diagnostic user message when enumerating printers fails. Also tweaked...

chrome/service/cloud_print/printer_job_handler.cc

 // Copyright (c) 2010 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/printer_job_handler.h"
 
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/md5.h"
 #include "base/string_util.h"
@@ skipping 47 matching lines @@
 }
 
 bool PrinterJobHandler::Initialize() {
   if (print_system_->IsValidPrinter(
       printer_info_.printer_name)) {
     printer_watcher_ = print_system_->CreatePrinterWatcher(
         printer_info_.printer_name);
     printer_watcher_->StartWatching(this);
     CheckForJobs(kJobFetchReasonStartup);
   } else {
-    // This printer does not exist any more. Delete it from the server.
-    OnPrinterDeleted();
+    // This printer does not exist any more. Check if we should delete it from
+    // the server.
+    bool delete_from_server = false;
+    delegate_->OnPrinterNotFound(printer_info_.printer_name,
+                                 &delete_from_server);
+    if (delete_from_server)
+      OnPrinterDeleted();
   }
   return true;
 }
 
 PrinterJobHandler::~PrinterJobHandler() {
   if (printer_watcher_)
     printer_watcher_->StopWatching();
 }
 
 void PrinterJobHandler::Reset() {
@@ skipping 552 matching lines @@
 }
 
 void PrinterJobHandler::OnJobSpoolFailed() {
   DCHECK(MessageLoop::current() == print_thread_.message_loop());
   job_spooler_ = NULL;
   job_handler_message_loop_proxy_->PostTask(FROM_HERE,
                                             NewRunnableMethod(this,
                                                 &PrinterJobHandler::JobFailed,
                                                 PRINT_FAILED));
 }