Update Media Key Config Before Making Queries
Update Media Key Config Before Making Queries

Before checking support for any media keys, update all
the configs to remove empty capabilities.

Issue #1567
Change-Id: Ia7aa5561c767b9049ff2f5eb731f6772a1598124

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