Revert MediaSource append window fudge factor
Revert MediaSource append window fudge factor

This hack is no longer needed to avoid gaps, since we now have a
gap-jumping implementation in the player.

The fudge factor was causing rounding errors in presentation duration
after an end-of-stream event, which could lead to playback hangs in
certain content.

Closes #979

Change-Id: I719813c8da8da08e1ebfb6daf7f6857757e7d228

TheModMaker/shaka-player,tvoli/shaka-player,vimond/shaka-player,vimond/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,TheModMaker/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,tvoli/shaka-player