Move IDLs to 39 roll

modules/encoding/TextDecodeOptions.idl

Index: modules/encoding/TextDecodeOptions.idl
diff --git a/core/streams/ReadableStream.idl b/modules/encoding/TextDecodeOptions.idl
similarity index 63%
copy from core/streams/ReadableStream.idl
copy to modules/encoding/TextDecodeOptions.idl
index 927fa94b9a9604b286a95cbc8edbee1d4f3eb020..a4e0974b5c067bc27e96d02afce969a09e66b446 100644
--- a/core/streams/ReadableStream.idl
+++ b/modules/encoding/TextDecodeOptions.idl
@@ -2,8 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+// http://encoding.spec.whatwg.org/#textdecoder
+
 [
-    RuntimeEnabled=Stream,
     GarbageCollected
-] interface ReadableStream {
+] dictionary TextDecodeOptions {
+    boolean stream = false;
 };