Fix failing StreamingEngine test.
Fix failing StreamingEngine test.

Commit 39e9b29c changed the API for PresentationTimeline but the
StreamingEngine integration tests weren't updated.

b/35797092

Change-Id: I06dd646f05f599916e760fb9bc4ebf16a99bb434

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