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

extensions/common/api/alarms.idl

Index: extensions/common/api/alarms.idl
diff --git a/extensions/common/api/alarms.idl b/extensions/common/api/alarms.idl
index 9d73f220c032ac2aa60a88b51750d59205c42191..500d2ed95181d79ed463a8bdf23c6e32d7fc2582 100644
--- a/extensions/common/api/alarms.idl
+++ b/extensions/common/api/alarms.idl
@@ -4,7 +4,7 @@
 
 // Use the <code>chrome.alarms</code> API to schedule code to run
 // periodically or at a specified time in the future.
-[use_movable_types=true] namespace alarms {
+namespace alarms {
   dictionary Alarm {
     // Name of this alarm.
     DOMString name;