Avoid karma v0.13.15
Avoid karma v0.13.15

Avoid karma v0.13.15, which has a bug that prevents our new
integration tests from running correctly on Chrome.
(See karma-runner/karma#1101)

Change-Id: Ia81410b1184ddca3a703d71cd923d4ec0ae5eefc

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