Remove leftover audioModem and copresensePrivate features.

chrome/common/extensions/api/_api_features.json

 // Copyright 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 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.
 //
 // Note that specifying "web_page", "blessed_web_page", or "all" as a context
 // type will require manually updating chrome/renderer/resources/dispatcher.cc.
@@ skipping 78 matching lines @@
       "content_script",
       "blessed_web_page",
       "web_page"
     ]
   },
   "appviewTag": {
     "internal": true,
     "dependencies": ["permission:appview"],
     "contexts": ["blessed_extension"]
   },
-  "audioModem": {
-    "dependencies": ["permission:audioModem"],
-    "contexts": ["blessed_extension"]
-  },
   "autofillPrivate": [{
     "dependencies": ["permission:autofillPrivate"],
     "contexts": ["blessed_extension"]
   }, {
     "channel": "trunk",
     "contexts": ["webui"],
     "matches": [
       "chrome://md-settings/*",
       "chrome://settings/*",
       "chrome://settings-frame/*"
@@ skipping 149 matching lines @@
   },
   "contextMenusInternal": {
     "internal": true,
     "channel": "stable",
     "contexts": ["blessed_extension"]
   },
   "cookies": {
     "dependencies": ["permission:cookies"],
     "contexts": ["blessed_extension"]
   },
-  "copresencePrivate": {
-    "dependencies": ["permission:copresencePrivate"],
-    "contexts": ["blessed_extension"]
-  },
   "cryptotokenPrivate": {
     "dependencies": ["permission:cryptotokenPrivate"],
     "contexts": ["blessed_extension"]
   },
   "dashboardPrivate": [{
     "channel": "stable",
     "contexts": ["blessed_web_page", "web_page"],
     "matches": ["https://chrome.google.com/*"]
   }, {
     "channel": "stable",
@@ skipping 561 matching lines @@
     "internal": true,
     "channel": "stable",
     "dependencies": ["permission:webview"],
     "contexts": ["blessed_extension"]
   },
   "windows": {
     "dependencies": ["api:tabs"],
     "contexts": ["blessed_extension"]
   }
 }