Fix internal references to shakaDemoMain.
Fix internal references to shakaDemoMain.

These were causing some error events to be run in the wrong scope.

Change-Id: I2cb13b9dbbac95ee7f8e361435904dd89eaa961c

shaka-project/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player,shaka-project/shaka-player,tvoli/shaka-player