Fix the clipboard feature spec.

extensions/common/api/_api_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 extension APIs implemented under src/extensions.
 // 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 132 matching lines @@
       "chrome://bluetooth-pairing/*",
       "chrome://md-settings/*",
       "chrome://settings/*",
       "chrome://settings-frame/*"
     ]
   }],
   "bluetoothSocket": {
     "dependencies": ["manifest:bluetooth"],
     "contexts": ["blessed_extension"]
   },
-  "clipboard": [{
+  "clipboard": {
     "dependencies": ["permission:clipboard", "permission:clipboardRead"],
-    "contexts": ["blessed_extension"],
-    "platforms": ["chromeos"]
-  }, {
-    "channel": "dev",
-    "extension_types": ["platform_app"]
-  }],  
+    "contexts": ["blessed_extension"]       
+  },
   "declarativeWebRequest": {
     "dependencies": ["permission:declarativeWebRequest"],
     "contexts": ["blessed_extension"]
   },
   "diagnostics": {
     "dependencies": ["permission:diagnostics"],
     "extension_types": ["platform_app"],
     "contexts": ["blessed_extension"]
   },
   "displaySource": {
@@ skipping 344 matching lines @@
   }, {
     "channel": "stable",
     "contexts": ["webui"],
     "matches": [
       "chrome://chrome-signin/*",
       "chrome://media-router/*",
       "chrome://oobe/*"
     ]
   }]
 }