[HTML Imports] Make import loading in order.

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 761 matching lines @@
     m_import = import;
 }
 
 void Document::didLoadAllImports()
 {
     executeScriptsWaitingForResourcesIfNeeded();
 }
 
 bool Document::haveImportsLoaded() const
 {
-    return !m_import || m_import->haveChildrenLoaded();
+    return !m_import || !m_import->isBlocked();
 }
 
 PassRefPtr<DocumentFragment> Document::createDocumentFragment()
 {
     return DocumentFragment::create(document());
 }
 
 PassRefPtr<Text> Document::createTextNode(const String& data)
 {
     return Text::create(this, data);
@@ skipping 4294 matching lines @@
 {
     return DocumentLifecycleNotifier::create(this);
 }
 
 DocumentLifecycleNotifier* Document::lifecycleNotifier()
 {
     return static_cast<DocumentLifecycleNotifier*>(ScriptExecutionContext::lifecycleNotifier());
 }
 
 } // namespace WebCore