[Qt] Remove empty function stubs from TestRunnerQt.
https://bugs.webkit.org/show_bug.cgi?id=112799

We are reducing the code in TestRunnerQt step by step,
in order to finally replace all of it with the generic
TestRunner implementation.
This patch removes several simple function stubs that
currently do not implement any actual functionality.

Reviewed by Kenneth Rohde Christiansen.

* DumpRenderTree/qt/TestRunnerQt.cpp:
* DumpRenderTree/qt/TestRunnerQt.h:
(TestRunnerQt):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@146337 268f45cc-cd09-0410-ab3c-d52691b4dbfc