Document the activeTab extension permission.

chrome/common/extensions/docs/server2/converter.py

 #!/usr/bin/python
 # 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.
 
 # Example run from the server2/ directory:
 # $ converter.py ../static/ ../../api templates/articles/ templates/intros/
 #   templates/public/ static/images/ -r
 
 import json
@@ skipping 31 matching lines @@
   'input_ime': 'input_ime',
   'app_runtime': 'app_runtime',
   'app_window': 'app_window',
 }
 
 # These are the extension-only APIs that don't have explicit entries in
 # _permission_features.json, so we can't programmatically figure out that it's
 # extension-only.
 # From api_page_generator.js:548.
 EXTENSIONS_ONLY = [
+  'activeTab',
   'browserAction',
   'extension',
   'input_ime',
   'fontSettings',
   'fileBrowserHandler',
   'omnibox',
   'pageAction',
   'scriptBadge',
   'windows',
   'devtools_inspectedWindow',
@@ skipping 296 matching lines @@
   if (not opts.file and len(args) != 6) or (opts.file and len(args) != 7):
     parser.error('incorrect number of arguments.')
 
   if opts.file:
     _MoveSingleFile(*args, replace=opts.replace, svn=opts.svn)
   else:
     _MoveAllFiles(*args,
                   replace=opts.replace,
                   exclude_dir=opts.exclude,
                   svn=opts.svn)