[HTML Imports] Let script of imported document running.

Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) Research In Motion Limited 2010-2011. All rights reserved.
@@ skipping 4168 matching lines @@
     initSecurityContext(DocumentInit(m_url, m_frame, m_import));
 }
 
 void Document::initSecurityContext(const DocumentInit& initializer)
 {
     if (haveInitializedSecurityOrigin()) {
         ASSERT(securityOrigin());
         return;
     }
 
-    if (!initializer.frame()) {
+    if (!initializer.hasSecurityContextSource()) {
         // No source for a security context.
         // This can occur via document.implementation.createDocument().
         m_cookieURL = KURL(ParsedURLString, emptyString());
         setSecurityOrigin(SecurityOrigin::createUnique());
         setContentSecurityPolicy(ContentSecurityPolicy::create(this));
         return;
     }
 
     // In the common case, create the security context from the currently
     // loading URL with a fresh content security policy.
@@ skipping 867 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore