Style checker should not check public Qt WK2 API for parameter_name.

Style checker should not check public Qt WK2 API for parameter_name.
https://bugs.webkit.org/show_bug.cgi?id=68359

Reviewed by Andreas Kling.

The public Qt WK2 APIs have different rules than WebKit for parameters of methods in h files.
Add an exception in the style checker to disable the check. Also added the test for it.

* Scripts/webkitpy/style/checker.py:
* Scripts/webkitpy/style/checker_unittest.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95446 268f45cc-cd09-0410-ab3c-d52691b4dbfc