Cleanup: remove the namespace-level nodoc annotations from Extension API

chrome/common/extensions/api/image_writer_private.idl

 // Copyright 2013 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.
 
 // Use the <code>chrome.image_writer</code> API to write images to
 // removable media.
 //
 // See the design doc for a detailed description of this API.
 // https://goto.google.com/image-writer-private-designdoc
-[nodoc] namespace imageWriterPrivate {
+namespace imageWriterPrivate {
   // The different stages of a write call.
   //
   // <dl>
   //    <dt>confirmation</dt>
   //    <dd>The process starts by prompting the user for confirmation.</dd>
   //    <dt>download</dt>
   //    <dd>The image file is being download if a remote image was
   //    requested.</dd>
   //    <dt>verifyDownload</dt>
   //    <dd>The download is being verified to match the image hash, if
@@ skipping 113 matching lines @@
 
     // Fires when a removable storage device is inserted.
     static void onDeviceInserted(RemovableStorageDevice device);
 
     // Fires when a removable storage device is removed.
     static void onDeviceRemoved(RemovableStorageDevice device);
   };
 
 };