http.playback.reverse_playback.vorbis_theora.1.ogg should be failed

Submitted by Young Han Lee

Link to original bug (#745518)

Description

http.playback.reverse_playback.vorbis_theora.1.ogg seems to have false negative result.

reverse_playback makes test media playback from end of file to 0 for testing reverse playback, but in this test vorbis_theora.1.ogg is played from 0 to end of file. So, while this test seems like it should fail, it actually 'passed' because it is ended successfully. The test scenario need to be modified to achieve intented result.