Show dialog as separate post task.

chrome/browser/ui/webui/print_preview/print_preview_handler.cc

 // Copyright (c) 2012 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/browser/ui/webui/print_preview/print_preview_handler.h"
 
 #include <ctype.h>
 
 #include <string>
 
@@ skipping 821 matching lines @@
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
       web_ui()->GetController());
   print_preview_ui->OnHidePreviewDialog();
 }
 
 void PrintPreviewHandler::HandleCancelPendingPrintRequest(
     const base::ListValue* /*args*/) {
   WebContents* initiator = GetInitiator();
   if (initiator)
     ClearInitiatorDetails();
-  gfx::NativeWindow parent = initiator ?
-      initiator->GetView()->GetTopLevelNativeWindow() :
-      NULL;
-  chrome::ShowPrintErrorDialog(parent);
+  chrome::ShowPrintErrorDialog();
 }
 
 void PrintPreviewHandler::HandleSaveAppState(const base::ListValue* args) {
   std::string data_to_save;
   printing::StickySettings* sticky_settings = GetStickySettings();
   if (args->GetString(0, &data_to_save) && !data_to_save.empty())
     sticky_settings->StoreAppState(data_to_save);
   sticky_settings->SaveInPrefs(Profile::FromBrowserContext(
       preview_web_contents()->GetBrowserContext())->GetPrefs());
 }
@@ skipping 686 matching lines @@
   printer_value->SetString("name", description.name);
   printer_value->SetBoolean("hasLocalPrinting", has_local_printing);
   printer_value->SetBoolean(
       "isUnregistered",
       description.id.empty() &&
       command_line->HasSwitch(switches::kEnablePrintPreviewRegisterPromos));
   printer_value->SetString("cloudID", description.id);
 }
 
 #endif