Enable Desktop Capture API for all apps in Stable channel.

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.
 
 // See c/c/e/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:
 //
 // $ echo -n "aaaabbbbccccddddeeeeffffgggghhhh" | \
@@ skipping 267 matching lines @@
       "channel": "beta",
       "extension_types": ["extension", "legacy_packaged_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension", "legacy_packaged_app"],
       // Legacy Browser Support (remove once this API hits stable).
       "whitelist": ["BC3A0F8D5AE0DE6454D74AB376EBCC59E10CDD5A"]
     }
   ],
-  "desktopCapture": [
-    {
-      "channel": "beta",
-      "extension_types": ["extension", "platform_app"]
-    },
-    {
-      "channel": "stable",
-      "extension_types": ["extension", "platform_app"],
-      "whitelist": [
-        "80B9DC58E5210749F052F5B4DB239C50CF72AEB6",
-        // Hangout Services component extension.
-        "DF84F03F9B960409CCDE0D895B9650EBE81C0A8E"
-      ]
-    }
-  ],
+  "desktopCapture": {
+    "channel": "stable",
+    "extension_types": ["extension", "platform_app"]
+  },
   "dns": [
     {
       "channel": "dev",
       "extension_types": ["extension", "platform_app"]
     },
     {
       "channel": "stable",
       "extension_types": ["extension", "platform_app"],
       "whitelist": [
         "7AE714FFD394E073F0294CFA134C9F91DB5FBAA4",  // CCD Development
@@ skipping 633 matching lines @@
     // Only allowed for whitelisted extensions until all the caveats are
     // addressed. Tracked in crbug/285151.
     "channel": "stable",
     "extension_types": ["extension"],
     "location": "component",
     "whitelist": [
       "D519188F86D9ACCEE0412007B227D9936EB9676B"  // GAIA Component Extension
     ]
   }]
 }