C++ function signature: Fix problem with multiline declarations.

QTextCursor::selectedText() has null chars where the tokenizer expects
newlines.

Change-Id: I15ae87ef8525c89812a61b80abda91d36bf56576
Reviewed-on: http://codereview.qt-project.org/4450


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