Change EME WebIDL to use ArrayBuffer/ArrayBufferView.

LayoutTests/media/encrypted-media/encrypted-media-utils.js

Index: LayoutTests/media/encrypted-media/encrypted-media-utils.js
diff --git a/LayoutTests/media/encrypted-media/encrypted-media-utils.js b/LayoutTests/media/encrypted-media/encrypted-media-utils.js
index 523eab05160081983597bf82df8027de583735d3..ed59afe2881e47190e86f15365f91b7ab7d90c78 100644
--- a/LayoutTests/media/encrypted-media/encrypted-media-utils.js
+++ b/LayoutTests/media/encrypted-media/encrypted-media-utils.js
@@ -85,9 +85,11 @@ function base64Encode(data)
 }
 
 // Creates a JWK from raw key ID and key.
+// |keyId| and |key| are expected to be ArrayBufferViews, not base64-encoded.
 function createJWK(keyId, key)
 {
     var jwk = '{"kty":"oct","kid":"';
+    // FIXME: Should use base64URLEncoding.
     jwk += base64Encode(keyId);
     jwk += '","k":"';
     jwk += base64Encode(key);