media: Change MediaKeyMessageEventInit to require both attributes

third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl

Index: third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl
diff --git a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl
index 669cb7b8cf0c1e9dd07c439efc585d176d4ff84b..1a8e92e1a184ab8054814718036d52cdd413cc5c 100644
--- a/third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl
+++ b/third_party/WebKit/Source/modules/encryptedmedia/MediaKeyMessageEventInit.idl
@@ -5,9 +5,6 @@
 // https://w3c.github.io/encrypted-media/#mediakeymessageevent
 
 dictionary MediaKeyMessageEventInit : EventInit {
-    MediaKeyMessageType messageType = "license-request";
-    // TODO(foolip): |message| should be required and not nullable.
-    // https://crbug.com/647693
-    // https://github.com/w3c/encrypted-media/issues/329
-    ArrayBuffer? message;
+    required MediaKeyMessageType messageType;
+    required ArrayBuffer message;
 };