json_schema_compiler: any, additionalProperties, functions on types

chrome/common/extensions/api/webstorePrivate.json

 [
   {
     "namespace":"webstorePrivate",
     "nodoc": "true",
     "functions": [
       {
         "name": "install",
         "description": "Installs the extension corresponding to the given id",
         "parameters": [
           {
@@ skipping 190 matching lines @@
               { "name": "login", "type": "string" }
             ]
           }
         ]
       },
       {
         "name": "setStoreLogin",
         "description": "Sets a preference value with the store login.",
         "parameters": [
           { "name": "login", "type": "string" },
-          { "name": "callback", "type": "function", "optional": "true" }
+          {
+            "name": "callback",
+            "type": "function",
+            "optional": "true",
+            "parameters": []
+          }
         ]
       },
       {
         "name": "promptBrowserLogin",
         "description": "Causes the browser to bring up the browser login UI.",
         "parameters": [
           {
             "name": "preferred_email",
             "type": "string",
             "description": "The email address to use to pre-populate the login dialog (can be an empty string)."
@@ skipping 29 matching lines @@
                 "type": "string",
                 "enum": ["webgl_allowed", "webgl_blocked"]
               }
             ]
           }
         ]
       }
     ]
   }
 ]