Fix VTTCue clash between VTT.js and Shaka(SUP-10832)
Fix VTTCue clash between VTT.js and Shaka(SUP-10832)

Our dependency management system loads Shaka polypill and then VTT.js
so VTT.js polypill takes over and causes a crash on Shaka.
Reinstalling the Shaka poly fills before instantiating it solves the
issue

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