Allow API functions and events to have entries in _api_features.json

chrome/common/extensions/api/test.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.
 
 [
   {
     "namespace": "test",
     "nodoc": true,
     "types": [],
     "functions": [
@@ skipping 274 matching lines @@
         "nocompile": true,
         "parameters": [
           {
             "type": "array",
             "name": "tests",
             "items": {"type": "function"}
           }
         ]
       },
       {
+        "name": "getApiFeatures",
+        "type": "function",
+        "unprivileged": true,
+        "nocompile": true,
+        "parameters": []
+      },
+      {
         "name": "getApiDefinitions",
         "type": "function",
         "nocompile": true,
         "parameters": [
           {
             "type": "array",
             "name": "apiNames",
             "optional": true,
             "items": {"type": "string"}
           }
@@ skipping 13 matching lines @@
             "properties": {
               "data": { "type": "string", "description": "Additional information." },
               "lastMessage": { "type": "boolean", "description": "True if this was the last message for this test" }
             }
           }
         ]
       }
     ]
   }
 ]