Replace MediaKeySystemOptions with MediaKeySystemConfiguration.

Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// https://w3c.github.io/encrypted-media/#idl-def-MediaKeySystemConfiguration
+
+enum MediaKeysRequirement {
+    "required",
+    "optional",
+    "not-allowed"
+};
+
+[
+    RuntimeEnabled=EncryptedMedia
+] dictionary MediaKeySystemConfiguration {
+    sequence<DOMString> initDataTypes;
+    sequence<MediaKeySystemMediaCapability> audioCapabilities;
+    sequence<MediaKeySystemMediaCapability> videoCapabilities;
+    MediaKeysRequirement persistentUniqueIdentifier = "optional";
+    MediaKeysRequirement persistentState = "optional";
+};