Deleting the copresence API.

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 109 matching lines @@
     "channel": "canary",
     "extension_types": ["extension"]
   }],
   "content_security_policy": {
     "channel": "stable",
     // Platform apps have a restricted content security policy that cannot be
     // overriden (except for a whitelist of exceptions, see the
     // app.content_security_policy whitelist).
     "extension_types": ["extension", "legacy_packaged_app"]
   },
-  "copresence" : {
-    "channel": "stable",
-    "extension_types": "all"
-  },
   "current_locale": {
     "channel": "stable",
     "extension_types": "all"
   },
   "default_locale": {
     "channel": "stable",
     "extension_types": "all"
   },
   "description": {
     "channel": "stable",
@@ skipping 185 matching lines @@
       "extension_types": ["platform_app"],
       "location": "component"
     }
   ],
   "webview": {
     "channel": "stable",
     "extension_types": ["platform_app"],
     "min_manifest_version": 2
   }
 }