Change EME WebIDL to use ArrayBuffer/ArrayBufferView.

Source/modules/encryptedmedia/MediaKeySession.idl

Index: Source/modules/encryptedmedia/MediaKeySession.idl
diff --git a/Source/modules/encryptedmedia/MediaKeySession.idl b/Source/modules/encryptedmedia/MediaKeySession.idl
index 7eb27a6ad6952cad6dd12029659609c102393cc4..d706bd48a1bb781b740673d68bd21382285022dd 100644
--- a/Source/modules/encryptedmedia/MediaKeySession.idl
+++ b/Source/modules/encryptedmedia/MediaKeySession.idl
@@ -37,6 +37,7 @@
     readonly attribute DOMString sessionId;
 
     // session operations
-    [CallWith=ScriptState] Promise update(Uint8Array response);
+    [CallWith=ScriptState] Promise update(ArrayBuffer response);
+    [CallWith=ScriptState] Promise update(ArrayBufferView response);
     [CallWith=ScriptState] Promise release();
 };