remove unused _set_preview_window from stream.h
remove unused _set_preview_window from stream.h


20071111225557-418b8-24e811a9a485e2f94f937493071fd66dbf582914.gz

freedesktop-unofficial-mirror/telepathy__telepathy-farsight,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farsight,freedesktop-unofficial-mirror/telepathy__telepathy-farstream,freedesktop-unofficial-mirror/telepathy__telepathy-farsight