Remove virtualized isRoot/isChild from HTMLImport.

Source/core/html/imports/HTMLImport.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 88 matching lines @@
     enum SyncMode {
         Sync  = 0,
         Async = 1
     };
 
     virtual ~HTMLImport() { }
 
     // FIXME: Consider returning HTMLImportTreeRoot.
     HTMLImport* root();
     bool precedes(HTMLImport*);
-    bool isRoot() const { return !isChild(); }
+    bool isRoot() const { return !parent(); }
     bool isSync() const { return SyncMode(m_sync) == Sync; }
     bool formsCycle() const;
     const HTMLImportState& state() const { return m_state; }
 
     void appendImport(HTMLImport*);
 
-    virtual bool isChild() const { return false; }
     virtual Document* document() const = 0;
     virtual bool isDone() const = 0; // FIXME: Should be renamed to haveFinishedLoading()
     virtual HTMLImportLoader* loader() const { return 0; }
     virtual void stateWillChange() { }
     virtual void stateDidChange();
 
 protected:
     // Stating from most conservative state.
     // It will be corrected through state update flow.
     explicit HTMLImport(SyncMode sync)
         : m_sync(sync)
     { }
 
     static void recalcTreeState(HTMLImport* root);
 
 #if !defined(NDEBUG)
     void show();
     void showTree(HTMLImport* highlight, unsigned depth);
     virtual void showThis();
 #endif
 
 private:
     HTMLImportState m_state;
     unsigned m_sync : 1;
 };
 
 } // namespace WebCore
 
 #endif // HTMLImport_h