Work around a Safari MSE bug
Work around a Safari MSE bug

This fixes test failures in StreamingEngine on Safari 9.  Safari does
not completely remove ranges from buffer, even if the range
encompasses all buffered data.

Change-Id: If6c810655ab11632b10f8706f8ef0657679174c4

Ross-cz/shaka-player,tvoli/shaka-player,TobbeEdgeware/shaka-player,TheModMaker/shaka-player,indiereign/shaka-player,tvoli/shaka-player,vimond/shaka-player,tvoli/shaka-player,Ross-cz/shaka-player,russitto/shaka-player,Ross-cz/shaka-player,russitto/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,baconz/shaka-player,shaka-project/shaka-player,indiereign/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,brightcove/shaka-player,TobbeEdgeware/shaka-player,TobbeEdgeware/shaka-player,brightcove/shaka-player,baconz/shaka-player,indiereign/shaka-player,baconz/shaka-player,shaka-project/shaka-player,russitto/shaka-player,shaka-project/shaka-player,brightcove/shaka-player