C++: Clean up semantic highlighter chunking code.

Change-Id: I5398442bdb864c4bccd8c193364bed3879bbc660
Reviewed-on: http://codereview.qt.nokia.com/4042
Reviewed-by: Fawzi Mohamed <fawzi.mohamed@nokia.com>

src/plugins/cppeditor/cppchecksymbols.h

@@ -169,8 +169,6 @@ private:
     QList<AST *> _astStack;
     QVector<Use> _usages;
     unsigned _lineOfLastUsage;
-    bool _flushRequested;
-    unsigned _flushLine;
 };
 
 } // namespace CPlusPlus