Remove most of the media stack.

sky/engine/public/web/WebRuntimeFeatures.h

Index: sky/engine/public/web/WebRuntimeFeatures.h
diff --git a/sky/engine/public/web/WebRuntimeFeatures.h b/sky/engine/public/web/WebRuntimeFeatures.h
index 3c13b9bd39b20e6797cc9941b2ec10d1ec678b43..782272fc1ee9a71a562cf409867464ed1c0cc9ea 100644
--- a/sky/engine/public/web/WebRuntimeFeatures.h
+++ b/sky/engine/public/web/WebRuntimeFeatures.h
@@ -44,12 +44,6 @@ public:
 
     BLINK_EXPORT static void enableDatabase(bool);
 
-    BLINK_EXPORT static void enableEncryptedMedia(bool);
-    BLINK_EXPORT static bool isEncryptedMediaEnabled();
-
-    BLINK_EXPORT static void enablePrefixedEncryptedMedia(bool);
-    BLINK_EXPORT static bool isPrefixedEncryptedMediaEnabled();
-
     BLINK_EXPORT static void enableBleedingEdgeFastPaths(bool);
 
     BLINK_EXPORT static void enableExperimentalCanvasFeatures(bool);
@@ -64,8 +58,6 @@ public:
 
     BLINK_EXPORT static void enableMediaCapture(bool);
 
-    BLINK_EXPORT static void enableMediaSource(bool);
-
     BLINK_EXPORT static void enableNotifications(bool);
 
     BLINK_EXPORT static void enableNavigatorContentUtils(bool);