C++ function signature: Don't accidentally eat specifiers.

You could accidentally delete specifiers like 'static' or 'virtual' with
the 'apply function signature changes' quick fix before.

Change-Id: Ia97a33f663a01063fad4d432551715ebf27a18d5
Reviewed-on: http://codereview.qt-project.org/4538


Reviewed-by: Leandro T. C. Melo <leandro.melo@nokia.com>