Show dialog as separate post task.

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

Index: chrome/browser/ui/webui/print_preview/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
index d8a48b4a3e6ded4f80d84489b61bfb55b2648d79..2461f599363ebd2a8e4b3a58f6c99854236fe303 100644
--- a/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview/print_preview_handler.cc
@@ -839,10 +839,7 @@ void PrintPreviewHandler::HandleCancelPendingPrintRequest(
   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) {