Make managedMode extension API component-only.

chrome/common/extensions/api/managedModePrivate.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": "experimental.managedMode",
-    "dependencies": ["types"],
+    "namespace": "managedModePrivate",
+    "nodoc": true,
     "functions": [
       {
         "name": "enter",
         "type": "function",
         "description": "Shows a confirmation dialog, then puts the browser into managed mode. The callback parameter will be true if managed mode was entered successfully, false if the user cancelled the confirmation. If managed mode is already on, trying to enter it again will have no effect.",
         "parameters": [
           {
             "type": "function",
             "name": "callback",
             "optional": true,
@@ skipping 33 matching lines @@
                   }
                 }
               }
             ]
           }
         ]
       }
     ]
   }
 ]