Revert spurious sample update

PiperOrigin-RevId: 325419476

demos/main/src/main/assets/media.exolist.json

@@ -4,7 +4,8 @@
     "samples": [
       {
         "name": "Google Glass H264 (MP4)",
-        "uri": "file:///sdcard/1.mp4"
+        "uri": "https://www.youtube.com/api/manifest/dash/id/bf5bb2419360daf1/source/youtube?as=fmp4_audio_clear,fmp4_sd_hd_clear&sparams=ip,ipbits,expire,source,id,as&ip=0.0.0.0&ipbits=0&expire=19000000000&signature=51AF5F39AB0CEC3E5497CD9C900EBFEAECCCB5C7.8506521BFC350652163895D4C26DEE124209AA9E&key=ik0",
+        "extension": "mpd"
       },
       {
         "name": "Google Play H264 (MP4)",