Call QWARN() instead of QTest::qWarn().
Call QWARN() instead of QTest::qWarn().

The QWARN macro wraps QTest::qWarn(), but the former is the public API
and the latter is merely an implementation detail that is subject to
change.

Change-Id: I02ae5ea384875afb7f235ef8dff0768a56afaa53
Reviewed-on: http://codereview.qt-project.org/5486
Reviewed-by: Qt Sanity Bot <5581206bb7e0307f0d99eb71898ae6b694149ca5@ovi.com>
Reviewed-by: Rohan McGovern <d75463945f40a9669160a73cef2843e56b22c602@nokia.com>

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