Replace MediaKeySystemOptions with MediaKeySystemConfiguration.

Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl

Index: Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl
diff --git a/Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl b/Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl
new file mode 100644
index 0000000000000000000000000000000000000000..48f3d55b2e739efc27bbcf103dde903c990ce96f
--- /dev/null
+++ b/Source/modules/encryptedmedia/MediaKeySystemConfiguration.idl
@@ -0,0 +1,21 @@
+// 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";
+};