CppEditor: Remove unused member from VirtualFunctionHelper

Change-Id: Icc73522fe108685aa09de37172a61dfa8d16ea9b
Reviewed-by: Nikolai Kosjar <nikolai.kosjar@digia.com>

src/plugins/cppeditor/cppfollowsymbolundercursor.cpp

@@ -79,7 +79,6 @@ private:
 
 private:
     // Provided
-    const QSharedPointer<TypeOfExpression> m_typeOfExpression;
     const Document::Ptr m_expressionDocument;
     Scope *m_scope;
     const Document::Ptr &m_document;