Remove Symbian-specific code from tests.

Symbian is not a supported platform for Qt5, so this code is no longer
required.

Change-Id: I273c8bffdeec2bb026936d93c00ef3c79b7a1ad9
Reviewed-on: http://codereview.qt-project.org/5775


Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Rohan McGovern <rohan.mcgovern@nokia.com>