Revert "Embedded Extension Options: remove flags and trunk channel restrictions"

chrome/common/extensions/api/_permission_features.json

 // Copyright (c) 2012 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 permissions for extension APIs implemented
 // under src/chrome.
 // 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 348 matching lines @@
       "F155646B5D1CA545F7E1E4E20D573DFDD44C2540",  // Google Cast Beta
       "16CA7A47AAE4BE49B1E75A6B960C3875E945B264"   // Google Cast Stable
     ]
   },
   "easyUnlockPrivate": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "location": "component"
   },
   "embeddedExtensionOptions": {
-    "channel": "dev",
+    "channel": "trunk",
     "extension_types": ["extension"]
   },
   "enterprise.platformKeys": {
     "channel": "stable",
     "platforms": ["chromeos"],
     "extension_types": ["extension", "legacy_packaged_app"],
     "location": "policy"
   },
   "enterprise.platformKeysPrivate": {
     "channel": "stable",
@@ skipping 657 matching lines @@
   },
   "webRequest": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   },
   "webRequestBlocking": {
     "channel": "stable",
     "extension_types": ["extension", "legacy_packaged_app"]
   }
 }