Destroy ManifestInfos during test tear-down.
Destroy ManifestInfos during test tear-down.

Without destroying ManifestInfos some SegmentIndexes may
persist outside the tests they were created in, which may
cause spurious test failures.

Change-Id: Ia6c2fe312b7bd6cd2dcd338dd43c20ce0a5715d6

samdutton/shaka-player,vpopolitov/shaka-player,sanbornhnewyyz/shaka-player,TobbeEdgeware/shaka-player,vimond/shaka-player,cmgrecu/shaka-player,samdutton/shaka-player,blinkbox/shaka-player,priyajeet/shaka-player,indiereign/shaka-player,indiereign/shaka-player,TobbeEdgeware/shaka-player,baconz/shaka-player,cmgrecu/shaka-player,TheModMaker/shaka-player,blinkbox/shaka-player,treejames/shaka-player,ustudio/shaka-player,baconz/shaka-player,treejames/shaka-player,Ross-cz/shaka-player,samdutton/shaka-player,TheModMaker/shaka-player,vimond/shaka-player,shaka-project/shaka-player,blinkbox/shaka-player,vpopolitov/shaka-player,ustudio/shaka-player,Ross-cz/shaka-player,russitto/shaka-player,ustudio/shaka-player,intfrr/shaka-player,blinkbox/shaka-player,vpopolitov/shaka-player,brightcove/shaka-player,baconz/shaka-player,shaka-project/shaka-player,vpopolitov/shaka-player,UIKit0/shaka-player,brightcove/shaka-player,Ross-cz/shaka-player,samdutton/shaka-player,ustudio/shaka-player,viniciusferreira/shaka-player,treejames/shaka-player,Afrostream/shaka-player,tvoli/shaka-player,UIKit0/shaka-player,russitto/shaka-player,vimond/shaka-player,shaka-project/shaka-player,Afrostream/shaka-player,treejames/shaka-player,rodrigoramos/shaka-player,brightcove/shaka-player,TheModMaker/shaka-player,russitto/shaka-player,tvoli/shaka-player,intfrr/shaka-player,sanbornhnewyyz/shaka-player,priyajeet/shaka-player,tvoli/shaka-player,tvoli/shaka-player,priyajeet/shaka-player,rodrigoramos/shaka-player,rodrigoramos/shaka-player,shaka-project/shaka-player,sanbornhnewyyz/shaka-player,intfrr/shaka-player,priyajeet/shaka-player,sanbornhnewyyz/shaka-player,cmgrecu/shaka-player,indiereign/shaka-player,rodrigoramos/shaka-player,viniciusferreira/shaka-player,Afrostream/shaka-player,Afrostream/shaka-player,UIKit0/shaka-player,TobbeEdgeware/shaka-player,TheModMaker/shaka-player,UIKit0/shaka-player,viniciusferreira/shaka-player,intfrr/shaka-player,viniciusferreira/shaka-player