Let ContentSecurityPolicy shared between imports and the master.

Source/core/html/imports/HTMLImportsController.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 51 matching lines @@
 {
     for (size_t i = 0; i < m_imports.size(); ++i)
         m_imports[i]->importDestroyed();
     if (m_master)
         m_master->setImport(0);
     m_master = 0;
 }
 
 HTMLImportChild* HTMLImportsController::createChild(const KURL& url, HTMLImport* parent, HTMLImportChildClient* client)
 {
-    OwnPtr<HTMLImportChild> loader = adoptPtr(new HTMLImportChild(url, client->isCreatedByParser()));
+    OwnPtr<HTMLImportChild> loader = adoptPtr(new HTMLImportChild(*m_master, url, client->isCreatedByParser()));
     loader->setClient(client);
     parent->appendChild(loader.get());
     m_imports.append(loader.release());
     return m_imports.last().get();
 }
 
 HTMLImportChild* HTMLImportsController::load(HTMLImport* parent, HTMLImportChildClient* client, FetchRequest request)
 {
     ASSERT(!request.url().isEmpty() && request.url().isValid());
 
@@ skipping 76 matching lines @@
 
 void HTMLImportsController::recalcTimerFired(Timer<HTMLImportsController>*)
 {
     do {
         m_recalcTimer.stop();
         HTMLImport::recalcTreeState(this);
     } while (m_recalcTimer.isActive());
 }
 
 } // namespace WebCore