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": [{

[Devlin, 2016/07/20 22:40:31]

features that have only one entry should not be a list, but rather a dictionary
(so remove the [] around the definition).

[jennyz, 2016/07/20 23:22:48]

Done.

+    "channel": "dev",

[Devlin, 2016/07/20 22:40:31]

the clipboard permission is already restricted to dev channel, so you don't need
to specify that here as well.  Ditto for extension_types.

[jennyz, 2016/07/20 23:22:48]

Done.

     "dependencies": ["permission:clipboard", "permission:clipboardRead"],
     "contexts": ["blessed_extension"],
-    "platforms": ["chromeos"]
-  }, {
-    "channel": "dev",
+    "platforms": ["chromeos"],

[Devlin, 2016/07/20 22:40:31]

Though there's no rule behind it, we typically put high-level, API-wide
restrictions like platforms, extension types, and channel in the
_permissions_features.json file, and then depend on that here.  Please move this
restriction to that file.  (Note there is an exception if a specific API method
is only available on a certain platform, as is the case with e.g. the
bluetoothLowEnergy entries above.)

[jennyz, 2016/07/20 23:22:48]

Done.

     "extension_types": ["platform_app"]
-  }],  
+  }],
   "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/*"
     ]
   }]
 }