[import] Cleanup: get rid of ad-hoc state machine.

Source/core/html/HTMLImportChild.h

 /*
  * 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 55 matching lines @@
 
     // HTMLImport
     virtual bool isChild() const OVERRIDE { return true; }
     virtual HTMLImportRoot* root() OVERRIDE;
     virtual Document* document() const OVERRIDE;
     virtual void wasDetachedFromDocument() OVERRIDE;
     virtual void didFinishParsing() OVERRIDE;
     virtual bool isDone() const OVERRIDE;
     virtual bool hasLoader() const OVERRIDE;
     virtual bool ownsLoader() const OVERRIDE;
-    virtual void didUnblockFromCreatingDocument() OVERRIDE;
-    virtual void didBecomeReady() OVERRIDE;
     virtual CustomElementMicrotaskImportStep* customElementMicrotaskStep() const OVERRIDE FINAL { return m_customElementMicrotaskStep; }
+    virtual void stateDidChange() OVERRIDE;
+
+#if !defined(NDEBUG)
+    virtual void showThis() OVERRIDE;
+#endif
 
     void setClient(HTMLImportChildClient*);
     void clearClient();
     bool loaderHasError() const;
 
 private:
     // RawResourceOwner doing nothing.
     // HTMLImportChild owns the resource so that the contents of prefetched Resource doesn't go away.
     virtual void responseReceived(Resource*, const ResourceResponse&) OVERRIDE { }
     virtual void dataReceived(Resource*, const char*, int) OVERRIDE { }
@@ skipping 15 matching lines @@
 
 inline HTMLImportChild* toHTMLImportChild(HTMLImport* import)
 {
     ASSERT(!import || import->isChild());
     return static_cast<HTMLImportChild*>(import);
 }
 
 } // namespace WebCore
 
 #endif // HTMLImportChild_h