chore: Drop MS EME polyfill (#4123)

The MS EME polyfill has been unused since v3.1 and removal of IE support, and isn't needed for Edge or Xbox One support. Closes #4113
shaka-project · Apr 13, 2022 · ead344f · ead344f
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diff --git a/build/types/polyfill b/build/types/polyfill
@@ -7,7 +7,6 @@
 +../../lib/polyfill/mediasource.js
 +../../lib/polyfill/media_capabilities.js
 +../../lib/polyfill/orientation.js
-+../../lib/polyfill/patchedmediakeys_ms.js
 +../../lib/polyfill/patchedmediakeys_nop.js
 +../../lib/polyfill/patchedmediakeys_webkit.js
 +../../lib/polyfill/pip_webkit.js

diff --git a/docs/tutorials/plugins.md b/docs/tutorials/plugins.md
@@ -69,9 +69,7 @@ __Polyfills__
       {@linksource shaka.polyfill.Fullscreen}
     - prefixed video QoE metrics:
       {@linksource shaka.polyfill.VideoPlaybackQuality}
-    - prefixed EME implementations for IE 11 and very old versions of embedded
-      Chrome/Chromium:
-      - {@linksource shaka.polyfill.PatchedMediaKeysMs}
+    - prefixed EME implementations:
       - {@linksource shaka.polyfill.PatchedMediaKeysWebkit}
       - {@linksource shaka.polyfill.PatchedMediaKeysNop}
     - variants of VTTCue and TextTrackCue constructors: