Back out changeset 1a0f522cf110 (bug 848652) because of assertion failures in MediaBufferDecoder.cpp

CLOSED TREE

--HG--
rename : content/media/webaudio/test/test_mediaDecoding.html => content/media/webaudio/test/test_decodeAudioData.html
Bug 868572. Move nsIScrollPositionListener file from view/ to layout/. r=mats

--HG--
rename : view/public/nsIScrollPositionListener.h => layout/generic/nsIScrollPositionListener.h