dash: Removing useless using namespace;

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
(cherry picked from commit 699b4b50c9a05d77484321acbc5bda5925f0f3cd)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/stream_filter/dash/xml/DOMParser.cpp

@@ -28,8 +28,6 @@
 #include "DOMParser.h"
 
 using namespace dash::xml;
-using namespace dash::http;
-using namespace dash::mpd;
 
 DOMParser::DOMParser    (stream_t *stream) :
     root( NULL ),