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

extensions/common/api/audio.idl

Index: extensions/common/api/audio.idl
diff --git a/extensions/common/api/audio.idl b/extensions/common/api/audio.idl
index 06a2cd35ac9e4d3e5b2055214b9d057c35f54255..36a1124bd3b66b81339248e984c368cb6b9e5885 100644
--- a/extensions/common/api/audio.idl
+++ b/extensions/common/api/audio.idl
@@ -5,7 +5,7 @@
 // The <code>chrome.audio</code> API is provided to allow users to
 // get information about and control the audio devices attached to the
 // system. This API is currently only implemented for ChromeOS.
-[use_movable_types=true] namespace audio {
+namespace audio {
 
   dictionary OutputDeviceInfo {
     // The unique identifier of the audio output device.