Extensions: Fix DocServer assert failures.

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

 # 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.
 
 import os
 import posixpath
 
 from compiled_file_system import SingleFile
 from extensions_paths import PUBLIC_TEMPLATES
 
@@ skipping 16 matching lines @@
   @SingleFile
   def _CollectDocumentedAPIs(self, base_dir, files):
     public_templates = []
     for root, _, files in self._file_system.Walk(base_dir):
       public_templates.extend(posixpath.join(root, name) for name in files)
     template_names = set(os.path.splitext(name)[0].replace('_', '.')
                          for name in public_templates)
     return template_names
 
   def GetCategory(self, api_name):
-    '''Return the type of api.'Chrome' means the public apis,
-    private means the api only used by chrome, and experimental means
-    the apis with "experimental" prefix.
+    '''Returns the type of api:
+        "internal":     Used by chrome internally. Never documented.
+        "private":      APIs which are undocumented or are available to
+                        whitelisted apps/extensions.
+        "experimental": Experimental APIs.
+        "chrome":       Public APIs.
     '''
     documented_apis = self._GenerateAPICategories()
+    if api_name.endswith('Internal'):
+      assert api_name not in documented_apis, \
+          "Internal API %s on %s platform should not be documented" % (
+              api_name, self._platform)
+      return 'internal'
     if (api_name.endswith('Private') or
         api_name not in documented_apis):
       return 'private'
     if api_name.startswith('experimental.'):
       return 'experimental'
     return 'chrome'
 
   def IsDocumented(self, api_name):
     return (api_name in self._GenerateAPICategories())