[Extensions] Remove the "use_movable_types" entry from idl/json files

chrome/common/extensions/api/cast_streaming_rtp_stream.idl

Index: chrome/common/extensions/api/cast_streaming_rtp_stream.idl
diff --git a/chrome/common/extensions/api/cast_streaming_rtp_stream.idl b/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
index da5d02f88ed3aa46701f82279dd9846305cda0d1..8425609f3f5d06e1e175b993da8ad8449af61103 100644
--- a/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
+++ b/chrome/common/extensions/api/cast_streaming_rtp_stream.idl
@@ -7,7 +7,7 @@
 // session.
 //
 // Valid stream IDs are positive and non-zero.
-[use_movable_types=true]namespace cast.streaming.rtpStream {
+namespace cast.streaming.rtpStream {
   // Params for audio and video codec.
   dictionary CodecSpecificParams {
     DOMString key;