Block scripted printing.

chrome/browser/printing/print_preview_tab_controller.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/printing/print_preview_tab_controller.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 197 matching lines @@
 }
 
 // static
 void PrintPreviewTabController::PrintPreview(TabContentsWrapper* tab) {
   if (tab->web_contents()->ShowingInterstitialPage())
     return;
 
   PrintPreviewTabController* tab_controller = GetInstance();
   if (!tab_controller)
     return;
-  tab_controller->GetOrCreatePreviewTab(tab);
+  if (!tab_controller->GetOrCreatePreviewTab(tab))
+    tab->print_view_manager()->PrintPreviewDone();
 }
 
 TabContentsWrapper* PrintPreviewTabController::GetOrCreatePreviewTab(
     TabContentsWrapper* initiator_tab) {
   DCHECK(initiator_tab);
 
   // Get the print preview tab for |initiator_tab|.
   TabContentsWrapper* preview_tab = GetPrintPreviewForTab(initiator_tab);
   if (!preview_tab)
     return CreatePrintPreviewTab(initiator_tab);
@@ skipping 308 matching lines @@
   PrintPreviewUI* print_preview_ui = static_cast<PrintPreviewUI*>(
       preview_tab->web_contents()->GetWebUI()->GetController());
   if (print_preview_ui)
     print_preview_ui->OnTabDestroyed();
 
   preview_tab_map_.erase(preview_tab);
   RemoveObservers(preview_tab);
 }
 
 }  // namespace printing