Fixed `look at symbol under cursor' when symbol is a Qt method (e.g. a signal).

Done with: erikv

src/libs/cplusplus/TokenUnderCursor.h

@@ -52,8 +52,6 @@ public:
     { return _tokens; }
 
 private:
-    int previousBlockState(const QTextBlock &block) const;
-
     QList<SimpleToken> _tokens;
     QString _text;
 };