HTML Imports: Let dynamically-added imports sync.

Source/core/html/imports/LinkImport.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 101 matching lines @@
 
 void LinkImport::importChildWasDestroyed(HTMLImportChild* child)
 {
     ASSERT(m_child == child);
     m_child = 0;
     clear();
 }
 
 bool LinkImport::isSync() const
 {
-    return m_owner && m_owner->isCreatedByParser() && !m_owner->async();
+    return m_owner && !m_owner->async();
 }
 
 HTMLLinkElement* LinkImport::link()
 {
     return m_owner;
 }
 
 bool LinkImport::hasLoaded() const
 {
     return m_child && m_child->isDone() && !m_child->loaderHasError();
 }
 
 } // namespace WebCore