[HTML Imports] Let script of imported document running.

Source/core/html/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 190 matching lines @@
 
 HTMLImportLoader::State HTMLImportLoader::finishParsing()
 {
     if (!m_parent)
         return StateError;
     return StateReady;
 }
 
 Document* HTMLImportLoader::importedDocument() const
 {
-    if (m_state != StateReady)
+    if (m_state == StateError)
         return 0;
     return m_importedDocument.get();
 }
 
 void HTMLImportLoader::importDestroyed()
 {
     m_parent = 0;
     if (RefPtr<Document> document = m_importedDocument.release())
         document->setImport(0);
 }
@@ skipping 124 matching lines @@
 void HTMLImportsController::wasDetachedFromDocument()
 {
     clear();
 }
 
 void HTMLImportsController::didFinishParsing()
 {
 }
 
 } // namespace WebCore