kiosk: Enable required_platform_version key on stable

extensions/common/api/_manifest_features.json

 // Copyright 2014 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.
 
 // This features file defines manifest keys implemented under src/extensions.
 // See extensions/common/features/* to understand this file, in particular
 // feature.h, simple_feature.h, and base_feature_provider.h.
 
 // To add a new whitelisted ID, SHA-1 it and force it to uppercase. In Bash:
 //
@@ skipping 165 matching lines @@
       "channel": "stable",
       "extension_types": ["platform_app"],
       "location": "component"
     }
   ],
   "key": {
     "channel": "stable",
     "extension_types": "all"
   },
   "kiosk": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "kiosk.required_platform_version": {
-    "channel": "dev",
+    "channel": "stable",
     "extension_types": ["platform_app"]
   },
   "kiosk_enabled": {
     "channel": "stable",
     "extension_types": [
       "platform_app"
     ]
   },
   "kiosk_only": {
     "channel": "stable",
@@ skipping 128 matching lines @@
       "extension_types": ["platform_app"],
       "location": "component"
     }
   ],
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "min_manifest_version": 2
   }
 }