Show dialog as separate post task.

chrome/browser/printing/print_error_dialog.cc

Index: chrome/browser/printing/print_error_dialog.cc
diff --git a/chrome/browser/printing/print_error_dialog.cc b/chrome/browser/printing/print_error_dialog.cc
index 5b57b08db83939c148e0a8448b5cbfdc1d9d0ee0..75fdd29896b461cadb630fefd9053460498695dc 100644
--- a/chrome/browser/printing/print_error_dialog.cc
+++ b/chrome/browser/printing/print_error_dialog.cc
@@ -4,17 +4,32 @@
 
 #include "chrome/browser/printing/print_error_dialog.h"
 
+#include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/simple_message_box.h"
+#include "content/public/browser/browser_thread.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
 namespace chrome {
 
-void ShowPrintErrorDialog(gfx::NativeWindow parent) {
-  ShowMessageBox(parent,
+namespace {
+
+void ShowPrintErrorDialogTask() {
+  Browser* browser = chrome::FindLastActiveWithHostDesktopType(
+      chrome::GetActiveDesktop());
+  ShowMessageBox(browser ? browser->window()->GetNativeWindow() : NULL,
                  l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_TITLE_TEXT),
                  l10n_util::GetStringUTF16(IDS_PRINT_SPOOL_FAILED_ERROR_TEXT),
                  MESSAGE_BOX_TYPE_WARNING);
 }
 
+}  // namespace
+
+void ShowPrintErrorDialog() {
+  // Nested loop may destroy caller.
+  content::BrowserThread::PostTask(content::BrowserThread::UI, FROM_HERE,
+                                   base::Bind(&ShowPrintErrorDialogTask));
+}
+
 }  // namespace chrome