[Extensions] Convert APIs to use movable types [4]

chrome/common/extensions/api/enterprise_platform_keys_private.json

 // Copyright (c) 2013 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.
 
 [
   {
     "namespace": "enterprise.platformKeysPrivate",
     "description": "none",
+    "compiler_options": {"use_movable_types": true},
     "functions": [
       {
         "name": "challengeMachineKey",
         "type": "function",
         "description": "Challenge a machine key.",
         "parameters": [
           {
             "type": "string",
             "name": "challenge",
             "description": "Challenge to be signed in base64."
@@ skipping 37 matching lines @@
                 "description": "Response in base64.",
                 "type": "string"
               }
             ]
           }
         ]
       }
     ]
   }
 ]